Elements

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Across
  1. 4. american five cent piece
  2. 6. metal that burns very brightly
  3. 9. sounds like a European country
  4. 11. precious metal
  5. 12. need for teeth and bones
  6. 15. found in bananas
  7. 16. Zn
  8. 17. most of the atmosphere
  9. 19. radioactive
  10. 22. bright city lights
Down
  1. 1. lighter than air, explosive gas
  2. 2. precious metal
  3. 3. lighter than air, non flammable gas
  4. 5. large sales of music
  5. 7. a very famous scientist
  6. 8. what this crossword is about
  7. 10. poisonous gas
  8. 13. conducts electricity well
  9. 14. makes diamonds and pencil leads (graphite)
  10. 18. we need this gas to survive
  11. 20. what you do with wrinkled clothes
  12. 21. Sn