Science

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Across
  1. 3. Found in all living things
  2. 4. Shiny precious material
  3. 7. Used in pools
  4. 9. Used in balloons
  5. 10. Used in batteries
  6. 11. Very reactive material
  7. 12. Burns in bright white light
  8. 15. Lightest element
  9. 16. Needed for breathing
  10. 18. Used in wires
  11. 19. Yellow solid smells bad
Down
  1. 1. Used to prevent rust
  2. 2. Used in computer chips
  3. 3. Good for bones
  4. 5. Glows in the dark
  5. 6. Lightweight metal (foil)
  6. 8. Makes up most of the air
  7. 13. Used to make steel
  8. 14. Explodes in water
  9. 17. Valuable yellow material