nuclear energy

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Across
  1. 1. positivly charged ion
  2. 6. decay process of gamma rays
  3. 7. below the atomic number and how heavy an element is
  4. 10. a big particle and cannot penetrate skin
  5. 11. one atom splits into smaller particles
  6. 12. how long it takes for half of something to decay
  7. 14. a nuetral charged particle
Down
  1. 2. atoms 83 and higer are this
  2. 3. two atoms collide and become helium and an extra atom
  3. 4. the center of an atom
  4. 5. ping pong balls and mouse traps
  5. 8. also the amount of protons
  6. 9. a small single electron and can penetrate skin but is stopped by aluminum
  7. 13. atom with a different amount of protons