Periodic Table of Elements

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Across
  1. 3. Element number 4
  2. 5. Used to keep pools clean (Cl)
  3. 7. Element with 6 protons
  4. 9. Superman's home planet
  5. 11. P
  6. 15. Used to make wires (Cu)
  7. 16. Thin foil used for cooking (Al)
  8. 18. Thing we breathe
  9. 20. Used to clean your teeth (F)
Down
  1. 1. Na
  2. 2. 12th Element
  3. 4. Album By Nirvana (Li)
  4. 6. Only one electron
  5. 8. Used in Neon signs
  6. 10. K
  7. 12. Smelliest Element (Pu)
  8. 13. The first Noble Gas
  9. 14. 2nd place medal
  10. 17. Chemical symbol Fe
  11. 19. Used as a form of currency