Science

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Across
  1. 3. Named after a state with the capital being Nashville
  2. 4. 5 cent coin
  3. 6. Periodic symbol is K
  4. 8. One of the Avengers
  5. 13. Cleans teeth
  6. 14. We use this to make balloons float
  7. 15. Is superman's only weakness
  8. 16. Makes food salty
  9. 18. Periodic number is 1
  10. 19. Periodic symbol is Al
Down
  1. 1. Lights up signs
  2. 2. Named after a famous genius
  3. 5. Named after a state with the capital being Sacramento
  4. 7. We use this to make jewelry
  5. 9. A planet
  6. 10. We put in pools
  7. 11. Worth a lot of money
  8. 12. Named after a continent
  9. 17. We breath this in