Chemistry Crossword

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Across
  1. 1. Energy levels where electrons are found.
  2. 5. Negatively charged particle.
  3. 6. Neutral particle in the nucleus.
  4. 8. The tendency of a substance to undergo chemical reactions.
Down
  1. 2. A pure substance consisting of only one type of atom.
  2. 3. Rows on the periodic table.
  3. 4. Positively charged particle in the nucleus.
  4. 7. Columns on the periodic table.