Nuclear Energy

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Across
  1. 3. Atom emits mass and energy
  2. 4. protons + neutrons
  3. 6. number of protons
  4. 8. Atomic number
  5. 9. From the sun
  6. 10. Center of atom
  7. 11. Substance decay by half
  8. 12. Different mass number
Down
  1. 1. strongest radiation
  2. 2. series of affected events
  3. 5. Used for atomic bombs
  4. 6. Helium nucleus
  5. 7. Negatively charged decay particle
  6. 10. Mass - atomic =