Find the mystery element

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Across
  1. 2. G first place
  2. 3. O humans need this is breathe
  3. 5. S 25 year anniversary
  4. 10. I not only a domestic chore
  5. 11. C important for bone health
  6. 13. N bright lights
  7. 14. P found in bananas
  8. 16. M time for a facial? calms redness and irritation
  9. 18. M also a planet in the solar system
  10. 19. S strike a match!
Down
  1. 1. H used in fuel cells to generate electricity
  2. 4. L battery power for a Tesla
  3. 6. L used to make pencils
  4. 7. Z important for your immune system
  5. 8. C found in cables
  6. 9. H party time! lets float some balloons
  7. 12. C jump in at the deep end, wear your googles!
  8. 15. S used as a condiment at the dinner table
  9. 17. N used to make coins