Nuclear energy

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Across
  1. 4. subtract the mass number from the atomic number
  2. 6. half the life of an element
  3. 7. powerhouse of the cell
  4. 11. emission of radiation
  5. 13. helps treat cancer
Down
  1. 1. nucleus is come into contact with and splits
  2. 2. two nuclei combine and form a larger nuclei
  3. 3. total number of protons and neutrons
  4. 5. blocked by aluminum
  5. 8. sequence of reactions
  6. 9. same as the atomic number
  7. 10. blocked by skin
  8. 12. same as the number of electrons
  9. 14. element with an altered number of electrons