Atomic Physics Crossword

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Across
  1. 3. one disintegration per second
  2. 6. two or more forms of the same thing
  3. 7. mass relates to an atom, in units
  4. 9. join together
  5. 10. life half its original value
  6. 14. formation of ions
  7. 15. counter measures radioactivity
Down
  1. 1. light and a noble gas
  2. 2. make inoperative
  3. 4. negatively charged
  4. 5. by the emission of radiation
  5. 8. relating to decay or particles
  6. 11. rod neutron absorbing substance
  7. 12. able to undergo nuclear fission
  8. 13. short for nuclear_