Title

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Across
  1. 1. related to Neutron
  2. 4. NaH
  3. 6. Gas, Solid, liquid
  4. 7. two outside the cloud
  5. 9. Non Explosive
  6. 11. Number
  7. 13. Explosive
  8. 14. Iron
  9. 15. o for oxygen
Down
  1. 2. related to Proton
  2. 3. Elements arranged in a group
  3. 5. the center
  4. 8. brave gas
  5. 10. Mass
  6. 12. Gas