6,7,8

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Across
  1. 1. no volume or shape
  2. 4. is everything
  3. 5. rows on table
  4. 7. composition of matter
  5. 12. colorless,anesthetic
  6. 13. two or more elements chemically joined
  7. 14. amount of matter
  8. 16. brow,gas,toxic
  9. 17. region at the center of an atom
  10. 18. unit volume of a substance
  11. 20. change mixture
  12. 21. nothing to do with metals
  13. 22. positively charged particle
Down
  1. 2. number of protons in nucleus
  2. 3. particles that make up two liquids
  3. 6. dissolves into something else
  4. 8. one atom
  5. 9. change in state of matter
  6. 10. atom that has a charge cause it gained or lost
  7. 11. two or more atoms
  8. 15. has definite shape
  9. 19. negatively charged particle