Nuclear-tastic crossword!

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Across
  1. 1. Weakly radioactive silver-white metal
  2. 6. Energy that is created when an atom is divided
  3. 7. (Two words) debris that fall from the atmosphere after a nuclear explosion
  4. 9. Immediate symptom of radiation sickness
  5. 11. "Likely to change"
  6. 12. When heavy atomic nucleus split into smaller nuclei
Down
  1. 2. Same number of protons but different neutron counts
  2. 3. You would take _______ to avoid danger
  3. 4. Used in cancer treatments
  4. 5. Nice to have in winter
  5. 8. Atomic number 92
  6. 10. The amount of energy released when an atomic bomb detonates