Physics work

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Across
  1. 2. the second element
  2. 4. the centre of a cell
  3. 8. particle with neutral charge
  4. 9. particle with negative charge
  5. 11. what a sponge does to water
  6. 12. the first element
  7. 15. what everything is made of
Down
  1. 1. what radiation does to cells
  2. 3. created to balance a charge
  3. 5. particle with positive charge
  4. 6. where electrons are contained
  5. 7. a particle can become:
  6. 10. the radiation found in fire alarms
  7. 13. after a certain period things can:
  8. 14. the wave like radiation