Nuclear Chemistry

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Across
  1. 3. the fuel for fusion reactions
  2. 4. a particle emitted that is identical to a helium nucleus
  3. 6. splitting of a heavy nucleus
  4. 7. the time it takes for half the mass of a radioactive isotope to decay
  5. 13. the changing into another element by radioactive decay
  6. 17. large nuclei need a neutron to _ ratio of over 1:1 to be stable
  7. 18. particle emitted when neutron changes into a proton in the nucleus
  8. 21. fusion reactions only occur at extremely high _
  9. 22. this type of nuclei, with mass numbers over 82, are always unstable
  10. 23. the nucleus makes up almost all of the _ of an atom
  11. 24. atoms of the same element with different masses
Down
  1. 1. man-made elements are produced by the _ of an isotope with nuclear "bullets"
  2. 2. reaction occurring when neutrons produced in fission reactions strike other nuclei
  3. 5. minimum mass required for chain fission reactions is _ mass
  4. 8. the combination of two nuclei into one
  5. 9. unstable nuclei are
  6. 10. A nuclear _ controls fission chain reactions to produce useable energy
  7. 11. emission with no change of mass or charge
  8. 12. the force of attraction between nearest neighbor nucleons
  9. 14. fusion naturally occurs on the:
  10. 15. protons and neutrons
  11. 16. nuclear bullets used in fission reactions
  12. 19. One danger of nuclear reactors is the breakdown of cooling systems, allowing this
  13. 20. when electrical _ between protons is greater than strong forces, the nucleus will be unstable