Chemistry

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Across
  1. 4. smallest type of matter
  2. 6. respresents a chemical reaction
  3. 7. anything that takes up space and has mass
  4. 9. ending substance
  5. 10. respresents a chemical substance
Down
  1. 1. starting substance
  2. 2. electron in the highest energy level
  3. 3. positively charged ion
  4. 5. charged atom
  5. 8. negatively charged ion