Chemistry Crossword

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Across
  1. 1. Charged atom or molecule
  2. 3. Substance formed in a chemical reaction
  3. 4. Gaining electrons or decreasing oxidation state
  4. 6. Pure substance made of one type of atom
  5. 7. Same element, different number of neutrons
  6. 8. Starting substance in a chemical reaction
Down
  1. 2. Losing electrons or increasing oxidation state
  2. 5. Negatively charged particle in atoms