Breaking Down Matter

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Across
  1. 3. 21% of the air we breathe
  2. 8. purest substance that can't be broken down
  3. 9. negative charge surrounding the nucleus
  4. 10. 2 or more atoms joined together
  5. 12. reaction reaction in which no new substance is formed
Down
  1. 1. 78% of the air we breathe
  2. 2. neutral charge in the nucleus
  3. 4. the center of an atom
  4. 5. the ability of matter to dissolve in a liquid
  5. 6. reaction reaction that forms a new substance
  6. 7. positive charge in the nucleus
  7. 11. 2 or more different atoms joined together
  8. 13. smallest part of an element that is microscopic