braking down the elements

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Across
  1. 4. what you produce when you breath
  2. 6. you may recieve this as a reward
  3. 8. used to build buildings
  4. 10. used in medicine
  5. 11. used in cleaning materials
  6. 15. used in thermometers
  7. 17. what we use to write
  8. 19. used for nuclour power
  9. 20. what we breath
  10. 21. can make you rich
  11. 22. it's in our body
Down
  1. 1. used in most foods
  2. 2. used in radiotherapy
  3. 3. what we store in sometimes
  4. 5. used to conseal food
  5. 7. the lighest know metal
  6. 9. what we use to make spoons
  7. 12. what we drink everday
  8. 13. what we eat in cereal
  9. 14. what we put in ballons
  10. 16. makes pennys
  11. 18. used in salt