Radioactivity

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Across
  1. 2. the time it takes for the number of remaining nuclei to half in number
  2. 3. when an atom emits radiation
  3. 6. the unit for the activity( the number of decays per second)
  4. 8. a type of radiation involving at Helium nucleus
  5. 10. contains protons neutrons and electrons
  6. 11. when an atom gains or loses an electron
  7. 13. an uncharged particle
  8. 15. a source of background radiation
  9. 16. total number of protons and neutrons in an atom
  10. 17. a positively charged particle
Down
  1. 1. a type of radiation involving an electron
  2. 4. a negatively charged particle
  3. 5. the number of decays per second
  4. 7. a state an atom can be when it may give out nuclear radiation
  5. 9. total number of protons in an atom
  6. 12. has 6 protons
  7. 14. a type of radiation involving a high frequency elecromangetic wave