Physics words

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Across
  1. 4. energy gained / lost per charge unstable
  2. 5. measurement of current
  3. 8. negative particle in an atom
  4. 10. the name of radioactive deccay stopped by paper
  5. 12. neutral particle in an atom
Down
  1. 1. unit of energy beginning with J
  2. 2. the time it takes for half of radioactive material to deccay
  3. 3. the name of the radioactive deccay stopped by aluminium
  4. 6. a state when an atom deccays
  5. 7. the name of radioactive deccay stopped by lead
  6. 9. unit of energy beginning with C
  7. 11. posotive particle in an atom