Alpha decay simulation answers

alpha decay simulation answers Predict what happens to an element when it undergoes alpha decay. • What has to happen within the nucleus in order for an atom of Polonium-211 to decay? Alpha Decay Simulation (requires computer) Beta - (minus) Decay (β⁻) A proton in an unstable nucleus (parent) transforms into a neutron, beta particle (electron 0-1 e), and an electron antineutrino Write equations for: a) The alpha (α) decay of radon- 198 . 7. In alpha decay, an alpha particle is ejected from an unstable nucleus, so here's our unstable nucleus, uranium-238. See how random decay times relate to the half life. Use . Displaying top 8 worksheets found for - Phwt Simulation Niuclear Fission. Download the latest version from the developer's website This decay is random, and it depends on the nature of the element: this is radioactivity. Helicopter Lab - 16/24. At any given moment in time, there is a chance that an atom will decay, but there is also a Radioactive decay is the emission of energy in the form of ionizing radiation ionizing radiationRadiation with so much energy it can knock electrons out of atoms. Alpha decay can most simply be described like this: 1) The nucleus of an atom splits into two parts. The decay rate, or activity, of an isotope is dependent on the number of atoms present and April 7th, 2018 - related to phet colorado lab answers beta decay alpha the process of alpha decay a type of radioactive decay in Alpha Decay Phet Simulation Answers PDF' 'Answer Key To Phet Lab Decay PDF Download kde it org To demonstrate that the rates of decay of unstable nuclei can be measured, that the exact time that a certain nucleus will decay cannot be predicted, and that it takes a very large number of nuclei to find the rate of decay. Practice : Click Reset , turn off Show equation , and select Radium . Sal covers the basic ways that a nucleus of an atom can decay. (c) In lead-207, the potential barrier for alpha particles is infinitely high. Try to pause the simulation when something gets “shot out” of the nucleus. 2. Founded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations. What has to happen within the nucleus in order for an atom of Polonium-211 to decay? An has Suppose substance has halt-life: 0. Investigating “Alpha Decay” a. Repeat this at least 8 more times. Since the total number of nucleons must be conserved, the atomic number of the parent nucleus must decrease by two, and the mass number must decrease by four. Click on ‘Run Now’ and when the simulation opens click on the ‘Single Atom’ Tab. Watch alpha particles escape from a Polonium nucleus, causing radioactive alpha decay. Explain the concept of half life, including the random nature of it. • The half-life is the time it takes for half of the original sample of radioactive material to decay to half its Simulations: Alpha Decay, Beta Decay, Fission Review from CrashCourse (includes Nuclear Chem, Decay, E=mc 2 , Strong and Weak Forces, etc) Mass Energy Equivalence from Fullerton Radioactive decay proceeds according to a principal called the half-life. Watch alpha particles escape from a polonium nucleus, causing radioactive alpha decay. Outbreak - playable simulations of a disease outbreak A2A Simulations Stand-Alone Programs. In physics education research the word “model” is associated with David Hestenes and his colleagues, who advocated the use of models in physics instruction more than 20 years ago (Etkina et al, 2006). id Subject: Phet Alpha Decay Work Sheet Answers Keywords: Phet Alpha Decay Work Sheet Answers, pdf, free, download, book, ebook, books, ebooks Created Date: 3/18/2021 8:18:14 AM Download Ebook Alpha Decay Phet Simulation Answers Alpha Decay Phet Simulation Answers Use the download link to download the file to your computer. The probability that a given nucleus will decay in the next time interval Δt is independent of the history of the nucleus. Alpha Decay Phet Simulation Answers Get Free Phet Alpha Decay Lab Answers PhET simulation "Alpha Decay". Use MathJax to format equations. Alpha Decay. Alpha decay of the artificially produced radioisotope that is used in smoke detectors 237 93 5. Answer these in your notebook!!! Phet Simulation Alpha Decay Go to Phet Simulations. to watch the process repeatedly. Alpha Decay. April 19th, 2018 - Download And Read Phet Simulation Alpha Decay Answers Phet Simulation Alpha Decay Answers Feel Lonely What About Reading Books Book Is One Of The Greatest Friends To Accompany While In Your Lonely '' Phet Alpha Decay Work Sheet Answers hyggery com Radioactive decay, which forms a new element, is called transmutation. Please answer the following Name _____ Phet Simulation Alpha Decay Go to Phet Simulations. See how random decay times relate to the half life. Now, you have to investigate an illegal basis from which their miners are disappearing. Gauge your savvy on alpha decay by utilizing this interactive quiz and printable worksheet on alpha decay. Even though alpha particles are very energetic, they are so heavy that they use up their energy over In past years, I included all the details on alpha, beta and gamma decay in the PowerPoint, but I am working very hard this year on having multiple activities in each lesson. the decay radiation of an Am-241 source after 100 years since its creation (including the decay radiation from the daughters, grand-daughters,… , which were created by the decay of Am-241 during the described a computer simulation, based on dice game, for identify radioactive decay. Forget it; it will be right for you. Alpha particles (α) are positively charged and made up of two protons and two neutrons from the atom’s nucleus. After each decay, press the RESET NUCLEUS button to watch the process again. • Observe the decay of Po-211. Does there appear to be any pattern for the decay times that are represented on the chart? 3. 23 & 31 video (3 min) Inquiry Lab p. Watch beta decay occur for a collection of nuclei or for an individual nucleus. The gratifying book, fiction, history, novel, scientific Write your answers on another piece of paper if needed. Here, I explain what alpha decay Alpha and Beta Decay with Simulations This work should be preceded by two things. Click ‘Reset Nucleus’ and watch it again. There are different types of radioactive decay, and alpha decay is when there are too many protons in a nucleus. Questia Public Library has long been a Page 23/26 Beta particles travel faster than alpha particles and carry less charge (one electron compared to the 2 protons of an alpha particle) and so interact less readily with the atoms and molecules of the material through which they pass. Beta decay To find the answer to what you seek, you must answer me these questions three: Subtopic Alpha/Beta/Gamma Decay Fission/Fusion Half Lives Pros Cons of Nuclear Power Radiation Radioactive Isotopes Type Activity Animation Demonstration Lab Lesson Plan Project Simulation Video; Advanced Chemistry. g. Observe the decay of Po-211. An alpha particle is the same as a helium-4 nucleus. Here, the new atomic number is 90 - 2 = 88, and new mass number is 234 - 4 = 230. This type of decay is associated with heavy, unstable nuclides. Alpha decay typically occurs in nuclei that are so big that they can’t be stable. Thus, the atomic mass of the new element is decreased by four, and the atomic number is decreased by two. Phet Alpha Decay Work Sheet Answers Pdf Download Author: isco-iss. These unstable isotopes usually emit radiation in the form of alpha particles, beta particles, or gamma rays and transmute into an entirely different isotope. The decay chain (or series) of uranium-238 is shown in the following figure. Use the ‘ Play/Pause’ and ‘Step’ buttons at the bottom to control the running of the simulation. This simulation allows you to address, using three different isotopes, notions like radioactive decay, carbon dating, half life Alpha decay occurs primarily in heavy nuclei (A > 200, Z > 83). Repeat this at least 8 more times. At the top of the screen, click on the Single Atom tab b. Po 84 4 2 198 86. Once the core of polonium breaks down into lead, click Reset to start over with a new core of polonium. After completing this I will have students volunteer to answer questions 4-6 on the board. Watch the Polonium-211 atom until it decays. Coulomb potential barrier for alpha-particle decay; Question: ءً ٠٧:١٣ ، ٢٠١٤ ، ا ٢٠ أ Theradioactive disintegration of a nucleus by alpha-particle emission was firstsuccessfully a-decay). 1. It comes down to a consideration of attractive and repulsive forces acting within the nucleus. Write the complete nuclear equation. In alpha decay a helium nucleus,, is emitted. Write an equation for the alpha decay of radium, and then use the Gizmo to check your answer. Investigating “Alpha Decay” Start on the . Because the loss of an α particle gives a daughter nuclide with a mass number four units smaller and an atomic number two units smaller than those of the parent nuclide, the daughter nuclide has a larger n:p ratio than the parent nuclide. Pu. In comparing it to the dice simulation the decay constant would be the likelihood for any individual dice to decay, so 1 in 6 or . Greenhouse Lab - 22/24. PhET simulation: Alpha Decay; PhET simulation: Nuclear Fission; Nuclear Decay Types of Reactions Alpha Emission Beta Emission Gamma Emission Positron Emission Electron Capture Transmutation I Transmutation II Review Practice Quiz # 1 # 6 # 2 # 7 # 3 # 8 # 4 # 9 # 5 # 10 Nature of Decay Barium-137m is a product of a common fission product – Caesium – 137. Gas Law Lab - 24/24. Start by adding the function =RANDBETWEEN(1,10) to a column of 100 cells. The screen should look like this The key differences between the two simulations are the nuclei we can investigate and the time range wed. → beta particle (e-) + N-14 → This feature is not available right now. 2. 244. Nuclear Decay. unpad. • It is possible to predict the average behavior of lots of atoms, but impossible to predict when any one atom will decay. In addition to the usual alpha and beta particles visible in my condensation cloud chamber, I see occasional tracks that seem highly energetic -they easily penetrate the entire width of the cloud chamber (10-12 inches) going in one side and out the other. Investigating “Alpha Decay” Start on the . !!Therefore,!thebasic • Radioactive decay depends on chance. Alpha particles are commonly emitted by all of the larger radioactive nuclei , such as uranium (which becomes thorium as a result of the decay process), or radium Some nuclear radiation is given off, e. What isotope remains after the alpha decay of polonium-212? tab. In the following simulation, click on the single atom tab at the top, and watch alpha decay in action. Predict what happens to an element when it undergoes alpha decay. 2 Online Library Radioactive Decay Simulation Answer Key Radioactive Decay Coin Experiment - UKEssays. The animation has several layers to it that allow users to drill into more detail about the natural greenhouse effect and different aspects of it, including volcanic aerosols and human impacts from burning fossil fuels. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators Alpha Decay Phet Lab Answers Alpha Decay Phet Lab Answers - In this site is not the same as a answer directory you purchase in a tape stock or download off the web. Find and open the sim called Alpha Decay. Observe the decay of Polonium-211. 15. Some of the worksheets displayed are Chemistry, Fission fusion, 2017 2018 exploring nuclear energy, Phet simulation nuclear fission pdf, Nuclear chemistry work, Phet lab nuclear processes answers alpha decay, Nuclear fusion the power of the sun, Teaching ideas for topic 6 atomic and nuclear physics core. for elementary, middle and High School levels. The half-life (T½) is the amount of time necessary for one-half of the radioactive material to decay. Penetration of Gamma rays EM radiation and matter 30/12/2015 : Migrated. Practice: Click Reset, turn off Show equation, and select Radium. Golf Ball Lab - 14/24. First, you will investigate alpha decay using the Alpha Decay Part A: Alpha Decay Start by opening the PhET model “Alpha Decay”. unpad. id Subject: Phet Alpha Decay Work Sheet Answers Keywords: Phet Alpha Decay Work Sheet Answers, pdf, free, download, book, ebook, books, ebooks Created Date: 3/18/2021 8:18:14 AM Name _____ Phet Simulation Alpha Decay Go to Phet Simulations. Find and open the sim called Alpha Decay. Single Atom. Write a description of what happens in the alpha decay of an atom. Question 3 In "Single Atom" mode PhET Teacher Activities: Alpha Decay Simulation Lab Online Library Phet Alpha Decay Lab Answers Kochenore Alpha Decay Phet Lab Answers Alpha Decay Phet Lab Answers - In this site is not the same as a answer directory you purchase in a tape stock or download off the web. We can observed several decays and recreate the decay chain, which identifies the parent nucleus definitively. It is composed of 2 protons and 2 neutrons. ANSWER QUESTIONS #7-14 ASED ON RUTHERFORD’S EXPERIMENT SPEIFIALLY, NOT ON THIS LAB ACTIVITY. 1. • It is possible to predict the average behavior of lots of atoms, but impossible to predict when any one atom will decay. Page 14/30 Describe alpha and beta decay. For the second simulation the students are doing the Beta Decay Simulation where they visualize the beta decay of hydrogen-3. The main gamma ray of Barium-137m is 661keV photon. Practice: Click Reset, turn off Show equation, and select Radium. 3) The nucleus left behind has its atomic number reduced by 2 and its mass number reduced by 4 (that is, by 2 protons and 2 neutrons). The atomic number is written above the element’s symbol and tells you how many protons the element has. g. d. Watch alpha particles escape from a polonium nucleus, causing radioactive alpha decay. Observe the five main types of nuclear decay: alpha decay, beta decay, gamma decay, positron emission, and electron capture. Learners see how radioactive decay Beta decay, any of three processes of radioactive disintegration by which some unstable atomic nuclei spontaneously dissipate excess energy and undergo a change of one unit of positive charge without any change in mass number. This lesson is aligned to the NGSS via HS-PS1-8 : Develop models to illustrate the changes in the composition of the nucleus of the atom and the energy released during the Activity: Simulation Activity: Half-Life Investigation. Download Review Comments Questions & Answers . Rn He. After you run the simulation, you will notice that it looks very similar. + What isotope remains after the alpha decay of polonium-212 5. And finally gamma (γ) radiation is when photons are emitted. Click on ‘Run Now’ and when the simulation opens click on the ‘Single Atom’ Tab. yThis chain confirmed the discovery of roentgenium. What has to happen within the nucleus in order for an atom of Polonium-211 to decay? An has Predict what happens to an element when it undergoes alpha decay. Watch the atoms decay and watch the Decay Chart across Watch alpha particles escape from a Polonium nucleus, causing radioactive alpha decay. In alpha (α) in which a helium atom is emitted. e. Wave function doesn’t decay as much During alpha decay, an element emits a helium nucleus with 2 neutrons and 2 protons. Part A: Alpha Decay Start by opening the PhET model "Alpha Decay". Write a description of alpha decay for Po-211. In this simulation, students will have the opportunity to investigate the decay of two samples of unstable atoms. colorado. Nuclear Decay. Alpha!particles!played!an!important!role!in!nuclear!physics!before!the!invention!of! chargedparticleacceleratorsandwereextensivelyusedin research. How many half-lives would it take for 6. Pre-Class Work: PLEASE COMPLETE PRIOR TO CLASS ON WEDNESDAY, NOV 26. Gamma Decay Fill In The Answers In This Table''Phet Alpha Decay Radioactive Decay Atomic Nucleus April 23rd, 2018 - Phet Alpha Decay Download as Word Doc Phet Simulation Alpha Decay You might have to repeat this a few times to be sure of your answer 7' Anwser Sheet For Phet Simulation Alpha Decay decay are called “alpha decay” or “beta decay”, respectively. 237. Access Free Student Directions Alpha Decay Workshieet Answer Free Alpha Decay investigations - PhET Contribution During this portion of the activity they will follow the directions and model alpha decay. The alpha decays cause the number of protons and neutrons to diminish by 2, whereas beta-negative decay diminishes the number of neutrons by 1 and increases the number of protons by 1. This prototype has been tested with NVDA and Firefox. the alpha decay of polonium, and then use the Gizmo to check your answer. Do some research and compare and contrast the two events. To the right, complete the reaction that represents this process A Z X g, p p p 21) Suppose fluorine-19 underg oes gamma decay. In this simulation, students will have the opportunity to investigate the decay of two samples of unstable atoms. Write an equation for the alpha decay of radium, and then use the Gizmo to check your answer. This time download the "Beta Decay simulation. rtf link to view the file. Alpha decay of radium-226, the most abundant isotope of radium 226 Ra + He 88 2. disintegration of the elements as a result of radioactive decay. When a simulation starts alpha is set to 1 and this value slowly decays, based on the alphaDecay rate, until it reaches the alphaTarget of the simulation. Create a square array of atoms. The atomic mass is reduced by four from 211 to 207, and the atomic number is reduced by two from 84 to 82. the 9MeV alpha particle was more likely b. daughter half-life = 10 hrs. Students will interact with the simulation in order to decay the unstable samples resulting in a visual and graphical interpretation of half-life. (d) Lead 207 does decay by emitting an alpha particle, it just has a half-life longer than a few seconds, and so we do not see the decay in the simulation. In this simulation, students will have the opportunity to investigate the decay of two samples of unstable atoms. 20. For example, the radioactive element bismuth (210Bi) can undergo alpha decay to form the element thallium (206Th) with a reaction half-life equal to five days. Phet alpha decay answers In Group Activity Class 15: Alpha Decay You can pause modeling and then use the step for gradual analysis. Higher decay rates cause the simulation to stabilize more quickly, but risk getting stuck in a local minimum; lower values cause the Write an equation for the alpha decay of polonium, and then use the Gizmo to check your answer. g. Please answer this question on your own. Those photons are called “gamma quanta”, and such radiation is called “gamma radiation”. 'phet simulation alpha decay answers kvaser de may 4th, 2018 - read and download phet simulation alpha decay answers free ebooks in pdf format common and proper nouns activities 100 number line printable clock worksheets' 'Alpha Decay Phet Answers ankalk de Radioactive Decay Simulation Answer Key bsc honours natural sciences physics – open university. ac. Make sure that you first start by clicking on the single atom tab. Reset Nucleus. Write a nuclear equation for the decay of Polonium-211. Alpha decay causes the isotopes to lose 2 protons and 2 neutrons. In the nucleus, two forces are "battling" for dominance - the repulsion of the protons due to the electric force, and the attractive nature of the strong nuclear force that draws protons and neutrons together. This is easy to detect and tells you the exact relation between the chain members. 9. Norton Chapter 21: Balancing Nuclear Equations, Radioactive Decay Modes Khan Academy : Mass defect/Binding Energy, Stability & Nuclear Equations, Types of decay, Writing nuclear equations Additional Tutorials: Types of Radioactivity , Penetrating power , Transmutation , Band of Stability , Uses of Radioisotopes , To see all my Chemistry videos, check outhttp://socratic. PhET sims are based on extensive education <a {0}>research</a> and engage students through an intuitive, game-like environment where students learn through exploration and discovery. Nuclear fission is the process of splitting highly unstable atoms with neutrons to split them. An example of a decay whose parent nucleus no longer exists naturally is shown in Figure 10. A number of different radioisotopes will undergo this type of decay; this web page simulates the Polonium-211 atom. AP/IB Chemistry (1) Sort by Alpha Prime is a new action game in which you will embody an inspector of mines asteroids. The types of decay, and why they occur within an atom, are the focus of this chemistry video. Our beyond 5,394 manuals and Ebooks is the defense why customers keep Phet Alpha Decay Lab Answers Kochenore Get Free Phet Alpha Decay Lab Answers Phet Alpha Decay Lab alpha ray particles and the marbles aimed at represented the protons or nuclei in the atom(s). This value is constant no matter how • Radioactive decay Alpha decay Beta decay • Fundamental forces and their properties • Alpha particles, beta particles and gamma rays Rutherford's Geiger-Marsden scattering experiment Rutherford scattering simulation • Half-life • Absorption characteristics of decay particles • Isotopes • Background radiation Write a nuclear equation for the beta decay of 165 61 Pm: 165 61 Pm--> 165 62 Sm + 0 -1 e; Write a nuclear equation for the alpha decay of 165 62 Sm: 165 62 Sm--> 161 60 Nd + 4 2 He; After students answer these questions I ask for two volunteers to put these on the board, so that students can check their answers. Will the same thing happen to an atom that undergoes gamma decay? Explain. Alpha decay (two protons and two neutrons) changes the mass number of the element by -4 and the atomic number by -2. Does the identity of an atom change during rad. U e. Thus, the correct description for the decay in Eq. I am confused by the difference and what the answer would be. 52 s. PhET sims are based on extensive education <a {0}>research</a> and engage students through an intuitive, game-like environment where students learn through exploration and discovery. + This simulation uses a Geiger counter to measure the number of alpha and beta decay particles emitted from an isotope in a five-second time interval. Alpha Decay is a computer model simulation that illustrates alpha decay . Three subsequent alpha decays result in a new element with an atomic mass of 232 - 3(4) = 220, and a new atomic number of 90 - 3(2) = 84. Summary. Use . Find and open the sim called Alpha Decay. Th-232 undergoes decay by emitting the following particles: alpha, beta, beta, alpha, alpha, alpha, alpha, beta, beta, alpha. What does this tell you about the decay of a specific nucleus having a predictable pattern or being random? Investigating “Half-life” 6) Now click on ‘Multiple Atoms’ and quickly empty the Bucket o’ Polonium by rapidly clicking the ‘Add 10’ button until the bucket is empty. Provide details and share your research! But avoid … Asking for help, clarification, or responding to other answers. Scholars will be in their element with these decay equations found in a video that solves an example of alpha decay and beta decay. dynamic Pseudocode of a second radioactive decay simulation. Conservation of momentum and kinetic energy gives: Bonus question: Is there a way to simulate the radiation of a decay chain of a parent isotope after some predefined time in 1 simulation, e. 1. Start by opening the PhET model “Alpha Decay”. 7 PHY 171 Lab Half-life and Radioactive Decay Purpose To simulate the hall of a radioactive isotope and to investigate the decay and bata decay Apparatus Computer, Simulation tosica Manel Videos linked below Introduction The rate of decay of a radioactive isotope is measured in half we the time for one-half of a radioactive quantity to decay. After each decay, press the RESET NUCLEUS button to watch the process again. The decay of radioactive materials is a random process, kind of like flipping a coin or rolling a die. While much of the nature of this strong interaction is still being worked out, we can say Exam Question- Stable And Unstable Nuclei. Choose a Δtime, the amount of time represented by each simulation step. This answer looks at ensuring We also up the alpha and eliminate alpha decay to allow the force to move the nodes as close as possible in a single tick to their Please be sure to answer the question. com The half-life of a given isotope is the amount of time it takes for half of the atoms in a sample to decay. Radioactive nuclei spontaneously decay. 3649 MeV where the value given is the mass excess Δ M. Context. Module 8: Lesson 1 Assignment Remember to submit your answers to RC 1, RC 2, RC 3, RC 4, RC 5, RC 6, and RC 7 to your teacher as part of your Module 8: Lesson 1 Assignment. An alpha particle is identical to a Helium atom. ANSWER QUESTIONS #7-14 ASED ON RUTHERFORD’S EXPERIMENT SPEIFIALLY, NOT ON THIS LAB ACTIVITY. The atom is therefore changed from polonium to lead. RADIOACTIVE DECAY AND HALF LIFE (2011;3) (b) Describe what is meant by the term, “half life of a radioactive nuclide”. Alpha Particles. There are different types of radioactive decay, and alpha decay is when there are too many protons in a nucleus. Write a nuclear equation for the decay of Polonium-211. 211 2. $\endgroup$ – Emilio Pisanty Jun 21 '18 at 11:32 $\begingroup$ @EmilioPisanty true, I just wanted to mention that there exists other/additional mechanisms resulting in free electrons. (Most of the time). 5 - Range = 0 – 125 hours, DT = 1 hour, parent half-life = 1 hour, rad. Observe the decay of Po-211. Types of decay. Radioactive Decay Lab Activity Key Introduction Unstable nuclei undergo spontaneous nuclear decay. • The half-life is the time it takes for half of the original sample of radioactive material to decay to half its Get Free Alpha Decay Phet Simulation Answers answers scrap book as the marginal today. An alpha decay will result in an overall reduction in size and even the property of the parent nucleus. Alpha particles come from the decay of the heaviest radioactive elements, such as uranium, radium and polonium. The instability caused by the alpha decay is corrected by the eventual beta decay, leading to the stable nucleus of lead 206, with its 82 protons and 124 neutrons. Users can watch a single atom decay or work with a "Bucket O' Polonium" to view a pattern of decay. These unstable isotopes usually emit radiation in the form of alpha particles, beta particles, or gamma rays and transmute into an entirely different isotope. Make sure that you first start by clicking on the single atom tab. Americium (pronounced a-meh-rees-ee-um) is a metal. org/chemistryAlpha decay is a type of radioactive (nuclear) decay. No lithium is involved. Np 93 0 92 1. The following atoms all undergo beta decay. Students will interact with the simulation in order to decay the unstable samples resulting in a visual and graphical interpretation of half-life. Less distance to tunnel. Answers''Alpha Decay Phet Simulation Answers Pdfsdocuments2 Com April 12th, 2018 - Alpha Decay Phet Simulation Answers Pdf Free Download Here PHET COLORADO LAB ANSWERS BETA DECAY Ebook Online Library Http Answerfull Com File P Phet Colorado Lab Answers Beta Decay Pdf''Phet Colorado Lab Answers Beta Decay sdrees de Or try a search for “PhET Alpha Decay”. 32 *brainstorm how you can limit radiation exposure *choose alpha, beta, or gamma source and conduct experiment *share conclusion Answers Alpha Decay simulation - now there are separate Alpha Decay and Nuclear Fission sims. Soon you will discover that nothing is what it seems in this asteroid and his survival options depend of your reflexes. Alpha particle bears a +2 electrical charge because there are no electrons to neutralize the positive charges of 2 protons. Such transformation of a nucleus For the first simulation they are doing the Alpha Decay simulation where they can see what happens to a Polonium-211 atom during alpha decay. Write a description of alpha decay for Po-211. → alpha particle + Pb-206 → alpha particle + Th-234 → alpha particle + Ra-234 → alpha particle + Po-218. Ionizing radiation can affect the atoms in living things, so it poses a health risk by damaging tissue and DNA in genes. Write an equation for the alpha decay of polonium, and then use the Gizmo to check your answer. tab - observe the decay of Polonium -211. Writing nuclear equations for alpha, beta, and gamma decay. . Observe the decay of Polonium-211. The decay of an unstable nucleus is a quantum process. Decay occurs primarily by emission of a helium nucleus from the radioisotope, a process called alpha decay, or by conversion of a neutron to a proton and electron followed by loss of the electron, called beta decay. Find and open the sim called Alpha Decay. Here is a simulation that shows alpha particles being emitted from a polonium nucleus. What has to happen within the nucleus in order for an atom of Polonium-211 to decay? Alpha Decay Beta Decay Controlled and Uncontrolled Chain Reaction- Natural Radioactive Series Nuclear Atom Nuclear Chain Reaction Nuclear Isotope Half-lives Nuclear Fission Particle Accelerator Radioactive Decay Simplified MRI Virtual Geiger Counter X-Ray Emissions X-Rays 'alpha decay phet simulation answers kungerkiezkraut de may 6th, 2018 - alpha decay phet simulation answers alpha decay phet simulation chemistry 1 by ss dara principles of ecology answer key mcgraw hill worksheet dna rna and protein''alphas betas and gammas oh my nuclear science week 1. Observe the decay of Polonium-211. Activity: Simulation Activity: Half-Life Investigation. 25% (0. With these tools, you'll have the 6 Radioactive Decay and Half Life Simulation 7. It's a bit difficult to explain so might be best just to follow the steps and you'll get the idea as we go along. RWIND Simulation - Wind Simulation & Wind Load Instead these are properties of a radioisotope known as the activity and the decay constant. 9 – Solve radioactive decay problems involving integral numbers of half-lives. The types of radiation are named in the order that they were discovered. Pu 94 0 94 * 0. Create accurate chants showing the number parent daughter (shade slight]yj 40 total 750 0 0 t = s 11, 04 s Student Directions Alpha Decay Answer Student directions Alpha Decay Names Learning Goals: Students will be able to: Explain alpha decay process. The 9 questions have students write a nuclear equations, predict daughter products (defined in Q. Practice: Click Reset, turn off Show equation, and select Radium. Radioactive Decay in a single atom: Open the “Alpha Decay” sim and go to the SECOND tab (single atom). The first page explains Rutherford’s experiment with diagrams included on the back. We saw the helium nucleus in the previous video. 2 is 6C 14! 7N 14 + e + ; (5) where is the neutrino emitted in decay. Students will interact with the simulation in order to decay the unstable samples resulting in a visual and graphical interpretation of half-life. Radioactive Decay Lab Activity Introduction Unstable nuclei undergo spontaneous nuclear decay. Americium-241, an alpha source. both had the same probability of tunneling () 2 2 VE m =− Decay constant: α V(r) 30 MeV 4MeV KE 9MeV KE Answer is a. This is the second lesson in a three-lesson series about isotopes, radioactive decay, and the nucleus. a. Write a description of what happens in the alpha decay of an atom. Among the products of radioactive decay of elements are alpha particles—small, positively charged particles. Gamma, or light, emission adds an extra concept to the equation. After undergoing alpha, beta or positron decay, the nucleus can still contain excess energy. 211 84 4 Po → 207 82 Pb + 2 He 2. experienced a nuclear accident at Three Mile Island. The decay rate, or activity, of an isotope is dependent on the number of atoms present and Unit 7A_Radioactive Decay Virtual Lab questions continued on next page Unit 7A Radioactive Decay Radioactive Decay Virtual Lab Name: Date: In today’s activity, you and your group will examine alpha and beta decay using a simulation, as these are things we cannot see in our lab. Some of the worksheets for this concept are Chemistry, Fission fusion, 2017 2018 exploring nuclear energy, Phet simulation nuclear fission pdf, Nuclear chemistry work, Phet lab nuclear processes answers alpha decay, Nuclear fusion the power of the sun, Teaching ideas for topic 6 atomic and nuclear physics core. faperta. The first page explains Rutherford’s experiment with diagrams included on the back. Begin to gain an understanding of the forces that work to hold an atomic nucleus together (strong nuclear force) and the forces that work to break it apart (Coulomb, i. Be specific and clear in your answers. See how random decay times relate to the half life . As an alpha particle is a helium nucleus 4 He, the mass number of the daughter nucleus is reduced by 4 and the atomic number (Z) is reduced by 2. Click on ‘Run Now’ and when the simulation opens click on the ‘Single Atom’ Tab. April 19th, 2018 - Download And Read Phet Simulation Alpha Decay Answers Phet Simulation Alpha Decay Answers Feel Lonely What About Reading Books Book Is One Of The Greatest Friends To Accompany While In Your Lonely '' Phet Alpha Decay Work Sheet Answers hyggery com Phet Alpha Decay Work Sheet Answers Pdf Download Author: isco-iss. Radioactive Decay: A Sweet Simulation of Half-Life radioactive decay a sweet simulation of half life answer key librarydoc70 pdf Keywords Reviewed by Miki Petrussen For your safety and comfort, read carefully e-Books radioactive decay a sweet simulation of half life answer key librarydoc70 PDF this Our Library Download File Free PDF Ebook. An important aspect of simulations is alpha. Quick Review Practice (not scored) – Turn to the periodic table in the very back of your physical science book. Nuclear Decay in Peat Bogs (start in class 1/15, due 1/16) Thursday/Friday Radioactive Decay and Seafloor Data Packet (do in class 1/16 and 1/17) Blank Map Answer Key Week 3 Monday Plate Boundaries Activity (finish in class 1/20-1/22)-Student Handout-Blank Plate Boundary Map-Master Maps Seismology Volcanology Geochronology Geography Tuesday Observe the five main types of nuclear decay: alpha decay, beta decay, gamma decay, positron emission, and electron capture. Try to pause the simulation when something gets “shot out” of the nucleus. Part A: Alpha Decay. What is the resulting isotope? Generally alpha decay doesn't create a neutron - it just expels some charge from the mother nucleus, which will be left with two extra electrons. Explain the concept of half life, including the random nature of it. Name _____ Phet Simulation. It transforms (or decays) into an atom with an atomic number 2 less and a mass number 4 less. • One very useful prediction we can make is the half-life. a single alpha or a single beta particle; Note that radioactive decay never means a nucleus just disappears. Answer Key to Nuclear Packet - Phet Simulation \u2014 Alpha Decay Go to Phet Simulations Find and open the sim called Alpha Decay Click on \u2019Run-Ndw\u2019 | Course Hero Answer Key to Nuclear Packet - Phet Simulation u2014 Alpha School Lord Byng Secondary Course Title OMLINE 1 This resource simulates the process of alpha decay, a type of radioactive decay in which an atomic nucleus emits an alpha particle. Among the types of radioactive decay, which form new elements, are alpha decay, beta decay, and positron (emission) decay. ) Nuclear Fission - Fission, Chain Reaction, Nucleus - PhET the phet lab nuclear processes answers alpha decay is universally compatible bearing in mind any devices to read. Orion Lab - 24/24. Half-life plot. The validation is based on gamma spectroscopy measurements with HPGe and Nal decay. Write a nuclear equation for the decay of Polonium-211. Find and open the sim called Alpha Decay. The half-life of a given isotope is the amount of time it takes for half of the atoms in a sample to decay. When the simulation opens, click on the ‘Single Atom ’ tab The nucleus that will be investigated is Polonium-211. noted in 1934 that if an additional neutral particle were emitted in decay, the three conservation laws would remain intact. edu/en/simulation/legacy/nuclear-fissionhttps://phet. Write an equation for the alpha decay of radium, and then use the Gizmo to check your answer. Start with a sample size of some number of atoms and a half-life. 2) One of these parts (the alpha particle) goes zooming off into space. Investigating “Alpha Decay” a. a Mark on Half-Life Questions in GCSE physics or Combined Science Rutherford Scattering and the Plum Pudding Model-PhET Simulation - Revision for A-Level Chemistry Radiation and Radioactive Decay Half Life Chemistry Problems - Nuclear Write an equation for the alpha decay of polonium, and then use the Gizmo to check your answer. First, students should have an opportunity to explore electric forces on a macroscopic scale by using pieces of plastic that obtain an electric charge when rubbed . What is an alpha particle? The simulation shows an atom’s nucleus: In this representation, are all the nucleons (protons and neutrons) in a center “nuclear ball,” or is the nucleus distributed in scattered sections? Analysis: Alpha and Beta decay both emit particles when they occur. In lead-207, the potential barrier for alpha particles is infinitely thick. Keep an eye on the core of polonium-211 until it disintegrates. Watch the Polonium-211 atom until it decays. As another example, consider the U-238 decay series shown in Figure 10. Such transformation of a nucleus Alpha Decay (Computer Lab Work) Directions: Open Google Chrome, type in “Phet alpha decay” 1. 5 billion years of its history. 2. Watch the Polonium-211 atom until it decays. The three processes are electron emission, positron (positive electron) Read 1 answer by scientists to the question asked by Wen Zhang on Jul 21, 2017 also Cooke model, the natural simulation timescale tau~15 ns, as mentioned in the text, which is really different Showing top 8 worksheets in the category - Phwt Simulation Niuclear Fission. Write an equation for the alpha decay of radium, and then use the Gizmo to check your answer. Make sure that you first start by clicking on the single atom tab. Answers to Selected End of Chapter Problems; Sample Question Solutions; Additional Links. Name _____ Phet Simulation. app . Because the loss of an α particle gives a daughter nuclide with a mass number four units smaller and an atomic number two units smaller than those of the parent nuclide, the daughter nuclide has a larger n:p ratio than the parent nuclide. Sample Learning Goals Explain what happens in alpha radiation. + Homework Statement In [itex]\alpha[/itex] decay a nucleus X at rest decays to a daughter nucleus Y and an [itex]\alpha[/itex] particle. ioactive decay? Why or why not? For alpha and beta decay it does because Decay Phet Lab Answers Alpha Decay Phet Lab Answers - In this site is not the same as a answer directory you purchase in a tape stock or download off the web. You can take a one month free trial for any InThinking site if you have neither had a paid subscription nor a free trial for that subject in the last two years. Calculate the probability of decay for each atom during Δtime, P = Δtime / half-life / 2. S. For the final simulation the students are playing the radioactive dating game Half life of beta decay vs half life of alpha decay?? I am doing a phet lab simulation and one of the questions asks me to define half-life in my own words for/based on alpha decay. what came before the big bang discovermagazine com. 7. • Radioactive decay depends on chance. After numerous alpha and beta decays, the series ends with the stable nucleus Pb-206. com Name ___Annalese Santiago____ Phet Simulation Alpha Decay Go to Phet Simulations. Water Lab - 17/24 The alpha-emitter can be blocked by just a sheet of paper, the beta-emitter can be blocked by lead or even a thick piece of wood and the gamma-emitter can only be blocked by multiple layers of lead. Polonium-211 is a very unstable isotope that will undergo alpha decay very quickly. On the Multiple Atoms tab drag a single nucleus out of the bucket into the white area. If the book opens in your web browser instead of saves to your computer, right-click the download link instead, and choose to save the file. b) The beta (β) decay of uranium-237 . Create a graphic (which could be as simple as a data table) that demonstrates the following: Ten pounds of a radioactive element, with a half life of 2 million years, after 10 million years. Look at the Decay Time Chart across the top of the screen. Click on the Single Atom tab. Investigating “Alpha Decay” a. Simulations, joita ei vielä ole käännetty kielelle Bulgaria. observations and inferences that led to each new model of the atom. Answers should include the number of nuclei remaining and the decreasing activity of the sample as the simulation runs. "Electron capture" by potassium-40, a natural source of radiation in the human body 40 4. + What isotope remains after the alpha decay of polonium-212? 5. Beta decay (most likely) leads to carbon-12 (stable), while beta+alpha leads to 3 alphas, which are also stable. Click ‘Reset Nucleus’ and watch it again. Alpha Decay: Alpha decay only occurs in the heaviest nuclei with \(Z > 83\) or \(A ≥ 200\). 14. the 4MeV alpha particle was more likely c. In alpha decay, the nucleus ejects a helium nucleus (alpha particle) composed of two neutrons and two protons, dropping the mass of the original nucleus by four mass units. com Answer to https://phet. 01 Half-Life and Radioactive Decay: Half-Life lab by This Alpha Decay Interactive is suitable for 6th - 12th Grade. Lab 12 Nuclear decay and MRI. Student Directions Alpha Decay Answer Key Directions: Open Alpha Decay by typing it into the search box. Make sure that you first start by clicking on the single atom tab. Those scattering interactions will tend to redistribute the alpha particle's kinetic energy until it is in thermal equilibrium with its surroundings. Write nuclear equations by determining the mass numbers and atomic numbers of daughter products and emitted particles. 1. He gives examples of beta decay, alpha decay, gamma decay, and positron emission. This simulation allows you to address, using three different isotopes, notions like radioactive decay, carbon dating, half life constant. Making statements based on opinion; back them up with references or personal experience. Quick Review Practice (not scored) – Turn to the periodic table in the very back of your physical science book. Beta particles can be stopped by a few millimetres of aluminium. Observe the decay of Polonium-211. colorado. Write nuclear equations by determining the mass numbers and atomic numbers of daughter products and emitted particles. Write the nuclear equation for the decay of PO-210 if it undergoes 2 consecutive alpha decays followed by a beta decay followed by another alpha decay. Polonium-211 has a half-life of about half a second but the alpha decay can take place anywhere from 0 to 3 seconds after resetting the nucleus. Unit 7ARadioactive Decay irtual ab uestions continued on next page Unit 7A Radioactive Decay Radioactive Decay Virtual Lab Name: Date: In today’s activity, you and your group will examine alpha and beta decay using a simulation, as these are things we cannot see in our lab. Observe the decay of Po-211. • One very useful prediction we can make is the half-life. between 1 and 3 radioactive isotopes, for a total of 70 radioisotopes. Quantum bound state simulation Potential energy curve for alpha decay Radon-222: 86 protons, Penny Decay: Simulation of the First Order Kinetics of Radioactive Decay ATOMS: HALF LIFE QUESTIONS AND ANSWERS . It should display the decayed nuclei of all of the previous trials you watched. Explain what half-life means in terms of single particles and larger samples. In learning more, Rutherford and his co-workers began studying what happened when a narrow beam of alpha particles was directed at a thin piece of gold foil. Lesson Notes & Activity: Atomic Stability p. In \(\alpha\)-particle decay (or alpha decay), the nucleus loses two protons and two neutrons, so the atomic number decreases by two, whereas its mass number decreases by four. Is there any way to predict when a specific piece of candy will land marked side up or “decayed?” There are various ways in which nuclei can decay through emitting radiation . $\endgroup$ – Jon Custer Feb 26 '15 at 19:36 We present validation measurements for the Geant4 radioactive decay simulation following a self-consistent approach. 19) In alpha decay, the atom undergoing the decay changed to a different atom. At the top of the screen, click on the Single Atom tab b. More mysteriously, their orientation is Beta Emission/Decay; Gamma Emission/Decay; Alpha Emission. Founded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations. Write a nuclear equation for the decay of Polonium-211. To learn more, see our tips on writing great In this study, the Monte Carlo simulation was used to evaluate the efficiency of the alpha particle-generated kinetic energy and momentum and analyze the feasibility of direct alpha decay propulsion; the propulsion and final velocity of the spacecraft by alpha decay propulsion were calculated and compared with the results of solar sails. Write an equation for the alpha decay of polonium, and then use the Gizmo to check your answer. In this simulation the Excel random generator function =RANDBETWEEN(1,10) will be used to decide randomly if a nuclei will decay or not. Since the parent nucleus had lost two protons, the atomic number will also reduce by two, changing its elemental properties by two groups. The Decay Time given in the upper left corner is in units of ms (1000 ms = 1 s). Those photons are called “gamma quanta”, and such radiation is called “gamma radiation”. c) Plutonium- 244 undergoes gamma decay . Alpha, beta and gamma are the first three letters of the Greek alphabet. Remember the nucleus is just part of an atom, except that, when we talk about radioactivity, we tend to ignore the electrons that take up most of the volume. Directions: Open Alpha Decay 1. 2:17 PM Mon, Jun 16, 2003 08. Here is a simulation that shows alpha particles being emitted from a polonium nucleus. See how random decay times relate to the half life. Both forms of decay release energy, and this energy has contributed to keeping the interior of the Earth warm over the 4. Alpha decay emits a helium atom and is associated with half-life while beta decay emits positrons or electrons to obtain an optimal ratio of protons and neutrons. Watch alpha particles escape from a polonium nucleus, causing radioactive alpha decay. Nuclear equations alpha and beta decay worksheet answers tesssh writing reactions gamma radioactive coloring pages practice chemistry series oguchionyewu tessshlo worksheets distance time graphs key beautiful tom schoderbek half lives reaction ninth grade lesson betterlesson solved pas 1 in our workshee chegg com Nuclear Equations Alpha And Beta Decay Worksheet Answers Tesssh Writing Reactions About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. I'm writing a simulation to model alpha-decay, and I need to know the kinetic energies of the alpha particles that are emitted. Would the result be more accurate if the average was calculated from the first four half-lives And I believe you are incorrect on the decay channels for boron-12. 7. 20) Suppose the generic atom X ( ) undergoes -emission. Half-life and carbon dating. Conservation of momentum and kinetic energy gives: Student Directions Alpha Decay Answer Key Directions: Open Alpha Decay by typing it into the search box. Both forms of decay Nuclear Processes Answers Alpha Decay Phet Lab Nuclear Processes Answers Alpha Decay Right here, we have countless books phet lab nuclear processes answers alpha decay and collections to check out. If a nucleus has an excess internal energy (in other words, if it is excited), then it may lose that energy by emitting it as a photon. high level radioactive waste management wikipedia. Thus, radium-226 decays through α-particle emission to form radon-222 according to the equation: 226 88 Ra → 222 86 Rn +4 2 He Alpha decay occurs when the nucleus ejects an alpha particle: an α-particle consist of two protons and two neutrons bound together and, hence, it’s identical to a helium nucleus. An alpha particle has the same composition as a helium nucleus. 2), alpha ray particles and the marbles aimed at represented the protons or nuclei in the atom(s). An alpha particle in matter will interact with electrons and nuclei by scattering. That is, when you observe the system, there is a probability that you will see the decay products rather than the original nucleus, because the wave function of the system is a superposition of the parent nucleus state and the daughter nucleus state (+alpha particles or whatever). faperta. 376 x 10 23) of the original number of nuclei? 7. tab - observe the decay of Polonium -211. Since no stable isotopes exist above atomic number 83, alpha decay stabilizes those isotopes having a Z value greater than 83 by lowering both the mass number and the atomic number. to watch the process repeatedly. We additionally meet the expense of variant types and moreover type of the books to browse. chapter 111 subchapter c texas education agency. As far as we know, nuclear decay is truly random, that is, random in the quantum mechanical sense. First, you will investigate alpha decay using the Alpha Decay simulation Radioactive decay. In tables, e. electric charge, force). See how random decay times relate to the half life. + What isotope remains after the alpha decay of polonium-212? 5. The following atoms all undergo alpha particle emission. Decay constant always smaller 3. Write an equation showing that when protactinium-229 goes through two alpha decays, francium-221 is formed. Heavy unstable nuclei emit \(\alpha\) radiation. Single Atom. Later in the lab I am asked in my own words to describe what half-life means for beta decay. 02 x 10 23 nuclei to decay to 6. 19. glencoe. edu/en/simulation/legacy/beta-decayh Alpha Decay (Computer Lab Work) Directions: Open Google Chrome, type in “Phet alpha decay” 1. It starts with Neptunium-237 and ends in the stable nucleus Bismuth-209. 211 2. During α-decay, an atomic nucleus emits an alpha particle. What isotope remains after the alpha decay of polonium-212? _____ 5. If a nucleus has an excess internal energy (in other words, if it is excited), then it may lose that energy by emitting it as a photon. The decay constant, denoted with the letter , is (as the term suggests) a constant. Our beyond 5,394 manuals and Ebooks is the defense why customers keep See full list on byjus. ac. for the decay of 212-Polonium, you would read 212 Po -10. An alpha particle at room temperature is just the same as a twice-ionized helium nucleus. Beta (β) radiation occurs when an electron is emitted. Load the simulator and then answer the following questions. Sample Learning Goals Explain what happens in alpha radiation. Alpha decay occurs primarily in heavy nuclei (A > 200, Z > 83). The 9 MeV electron more probable… 1. Students usually get creative and use their notebooks, phones, hands, shoes and anything else they have lying around to answer the question. Our beyond 5,394 manuals and Ebooks is the defense why customers keep coming The goal is to realize that alpha decay will reduce the mass of isotope by 4 and atomic number by 2. MathJax reference. In trying to learn more about the nature of alpha particles, Rutherford and his co-workers, Hans Geiger and Ernest Marsden, began studying what happened when a narrow beam of alpha particles was directed at a thin This is a basic animation/simulation with background information about the greenhouse effect by DAMOCLES. half life wikipedia. As was written, atomic nuclei consist of protons and neutrons, which attract each other through the nuclear force, while protons repel each other via the electromagnetic force due to their positive charge. Why does the Polonium (Po) become Lead (Pb) after a decay? e. In 1979, the U. There are two protons in the helium nucleus and two neutrons. Be specific and clear in your answers. Start on the Single Atom tab - observe the decay of process called alpha decay, or by conversion of a neutron to a proton and electron followed by loss of the electron, called beta decay. yMany heavy isotopes decay by alpha particle emission. alpha is a number between 0 and 1 and defines how far the simulation has progressed. need to extend your simulation period to answer this question. It's radioactive and gives off alpha radiation so we call it an alpha source. Among the products of the radioactive decay of elements are alpha particles—small, positively charged, high-energy particles. Examples of alpha decay are The alpha decay rate determines how quickly the current alpha interpolates towards the desired target alpha; since the default target alpha is zero, by default this controls how quickly the simulation cools. + Homework Statement In [itex]\alpha[/itex] decay a nucleus X at rest decays to a daughter nucleus Y and an [itex]\alpha[/itex] particle. . SIMULATION-Beta Decay Jump to News forum AS SPECIFICATION (includes data sheet) Data Sheet Specimen Paper Unit 1 Paper 1 June 2011 Mark scheme June 2011 Paper 1 January 2011 Mark scheme January 2011 Paper 1 January 2010 Paper 1 Jan 2010 Mark Scheme Paper 1-June 2010 June 2010 Mark scheme Paper 1 Jan 2009 _Paper 1 Jan 2009 Mark Scheme Paper 1 Alpha Decay. Write the complete nuclear equation. Explain the concept of half life, including the random nature of it. Part A: Alpha Decay Start by opening the PhET model "Alpha Decay". 194. Please try again later. Reset Nucleus. Start on the SINGLE ATOM tab. . physics with lab – easy peasy all in one high school. As an alpha particle is emitted, the number of neutrons and protons decreases, creating a more Models of the hydrogen atom phet simulation answers * Br Fundraisers had three If you have a sexy the Guess brand logos answers level 26 s sunflower br. Such neutral particles have actually been found and are called neutrinos. 1. This is a stamp album that will pretense you even supplementary to old thing. Worksheet -Unstable Nuclei When I was studying this for my GCSE physics course we only looked at the alpha and beta decay equations, however, my physics teacher did give me some room to wiggle here, so I studied Beta decay quite thoroughly, and here we go. Watch: Khan Academy: Radioactive Decay; Answer: Radioactive Pre-Class Questions; Day 1: Basis of Nuclear Decay In-Class Activities - Alpha Decay Simulation; Beta Decay Simulation decay are called “alpha decay” or “beta decay”, respectively. We've said before that the beta decay usually takes a much longer time than alpha decays. Radioactive decay of carbon-14, which is used in radiocarbon dating 3. Click worsheet 3 stable and unstable nuclei exam questions. The atomic number is written above the element’s symbol and tells you how many protons the element has. alpha decay simulation answers