Everyday, compound or Posison?

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Across
  1. 2. made of very fine particles
  2. 5. a very light gas and one of the chemical elements. (H)
  3. 7. the reason for which something is done or created.
  4. 9. an oxide containing just one atom of oxygen in the molecule
  5. 11. make a liquid) thinner or weaker by adding water or another solvent to it.
  6. 12. an object or device used to attack or defend.
  7. 14. our awareness of ourselves and our environment
  8. 15. breathed in
  9. 16. A part or element of a larger whole.
  10. 17. an adornment (as a bracelet) made of precious metals and set with gems
  11. 19. an animal protein that is used in glue, on film, and for making things like jelly.
  12. 21. able to catch fire easily
Down
  1. 1. a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound.
  2. 3. an oxide containing two atoms of oxygen in the molecule
  3. 4. distinguishable
  4. 6. the process of extracting something from a substance.
  5. 8. capable of catching fire or burning
  6. 10. A rapid reaction between oxygen and fuel that results in fire
  7. 13. deadly
  8. 16. to have held or enclosed something
  9. 18. the chemical element of atomic number 17, a gas. (Cl)
  10. 20. specific; fixed; established beyond doubt