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Name Date Period 21-2 Radioactive Decay Match the following terms with their definitions: 1. 2. 3. 4. 5. 6. 7. the spontaneous disintegration of a nucleus into a slightly lighter nucleus, that releases particles and/or radiation particles or electromagnetic radiation emitted from the nucleus during radioactive decay an unstable nucleus that undergoes radioactive decay A. daughter nuclide B. decay series C. half-life D. nuclear radiation the time required for half the atoms of a radioactive nuclide to decay E. parent nuclide a series of radioactive nuclides produced by successive radioactive decay until a stable nuclide is reached the heaviest nuclide of each decay series F. radioactive decay G. radioactive nuclide nuclides produced as a decay series progresses 8. When does a decay series end? 9. occurs when nuclei are bombarded with charged and uncharged particles. 10. All of the elements with more than are radioactive. 11. These elements are referred to as protons in their nuclei elements. Match the following properties with the type of radiation A. alpha particle D. B. beta particle E. C. gamma radiation F. or particle described: neutron positron all of these 12. has no effect on atomic number or mass number 13. 4 symbolized by 2 He because it resembles a helium nucleus 14. has the effect of increasing atomic number when emitted 15. travel at the speed of light 16. decreases the atomic number by 2 and atomic mass by 4 when emitted 17. emitted when a neutron is converted into a proton and an electron 18. usually emitted immediately following other types of decay when the nucleus is left in an excited state 19. emitted by unstable nuclei below the band of stability 20. emitted by unstable nuclei above the band of stability Solve the following problems. Show all your work. 21. 22. The half-life of plutonium-239 is 24,110 years. Of an original mass of 100. g, how much plutonium remains after 96,440 years? 1 16 Exactly of a given amount of protactinium-234 remains after 26.76 hours. What is the half-life of protactinium-234?