Chemistry escape room

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Across
  1. 4. Group 17 gas used in pools
  2. 6. (Blank)2O
  3. 9. Conductive metal used in wires
  4. 10. The element with the symbol Fe
  5. 11. Needed for fire
  6. 13. Found in bones
  7. 14. Same name as one of the planets in our solar system
Down
  1. 1. Found in all organic molecules
  2. 2. [Ar] 4s² 3d¹⁰
  3. 3. Used in nuclear weapons
  4. 5. Used at birthday parties
  5. 7. Valuable yellow metal
  6. 8. Strongest reaction when in contact with water
  7. 12. Used in batteries