Periodic Table

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123456789101112131415161718192021
Across
  1. 3. A coin that is five cents
  2. 7. Only metallic element that is liquid
  3. 9. Dairy is a good source of this element
  4. 12. Has the highest melting point of any metal
  5. 15. Used in some photographic flashes for high speed photography
  6. 16. Sounds like famous scientist who said, "Imagination is more important than knowledge"
  7. 18. Used in the manufacture of safety matches
  8. 20. Used to make control rods that are put into nuclear reactors
  9. 21. Atomic number is 72
Down
  1. 1. The medal you get when you place second in a tournament
  2. 2. A very bright color
  3. 4. The medal you get when you win a tournament
  4. 5. Makes our voices have a high pitch
  5. 6. Song sung by Sia and David Guetta
  6. 8. Makes drinking water safe and cleans pools
  7. 10. When it reacts with hydrogen it makes ammonia
  8. 11. What all plants breathe
  9. 13. Used in gunpowder, matches, fireworks, and treats skin diseases
  10. 14. What all animals breathe
  11. 17. Atomic number is 105
  12. 19. Salt