science

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Across
  1. 2. the number of protons
  2. 4. It has no charge
  3. 9. helium nucleus
  4. 10. positive charge
  5. 12. breaking up nucleus
  6. 13. how long it takes to reduce to half
  7. 14. heavy twin of atom
Down
  1. 1. protons plus neutrons
  2. 3. A neutron turns into a proton and electron is kicked out and the element changes
  3. 5. center of the atom
  4. 6. No charged particles released only high energy rays
  5. 7. radiation
  6. 8. atom bomb
  7. 11. combining of atoms