Chemistry so far...

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Across
  1. 3. mixture
  2. 4. mix, 2+ sub uniformly spread out
  3. 6. neutral charge subatomic particle in nucleus
  4. 8. positive charge subatomic particle in nucleus
  5. 11. smallest unit of chem compound,retain properties
  6. 12. NaCl
  7. 13. CH4
  8. 14. negative charge subatomic particle in cloud
  9. 17. uncuttable
  10. 19. elementary particle, makes up protons & neutrons
  11. 20. core of atom, made up of protons & neutrons
  12. 22. element found in all living things
Down
  1. 1. 2+ substances, can be separated by phys means
  2. 2. two or more elements chemically combined
  3. 5. mix, diff material can be distinguished
  4. 7. matter composed of only one type of atom
  5. 9. gas, Makes up 78% of the atmosphere
  6. 10. anything that has mass and takes u space
  7. 15. not matter
  8. 16. H20
  9. 18. matter, cannot be separated by phys means
  10. 21. Calcium