chemistry crossword

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Across
  1. 1. Layers where electrons orbit.
  2. 5. Negative particle outside the nucleus.
  3. 6. Neutral particle in the nucleus.
  4. 8. How easily an element reacts.
Down
  1. 2. Pure substance with one type of atom.
  2. 3. Horizontal row on the periodic table.
  3. 4. Positive particle in the nucleus.
  4. 7. Vertical column on the periodic table.