Chemistry

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