Chemistry Final

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Across
  1. 5. A negatively charged subatomic particle
  2. 6. It maintains its shape and volume
  3. 8. Uses boiling points to seperate componets
  4. 10. A group of atoms with a fixed composition
  5. 12. The sum of the number of neutrons and protons in an isotope
  6. 15. An electron in an atoms highest energy level
  7. 16. An atom change due to different amounts of protons and electrons
  8. 17. A reaction that makes a substance change properties
  9. 18. Doesn't have uniform compositions
Down
  1. 1. The distance between the same points on two waves
  2. 2. formed by two or more different atoms
  3. 3. A change you can see
  4. 4. The percentages that describe isotopic compositions
  5. 7. Formed from two or more pure substances
  6. 9. A property of matter that is quanity dependent
  7. 11. Uses particle size to seperate componets
  8. 13. The amount of protons in a atom
  9. 14. A type of pure substance that only has one atom