Chemistry

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Across
  1. 4. positive charge
  2. 6. negative charge
  3. 7. pure substance
  4. 8. elements chemically combined
  5. 9. tightly packed atoms
Down
  1. 1. anything that takes up space
  2. 2. barley packed atoms
  3. 3. 2 or more elements physically combined
  4. 5. neutral charge
  5. 10. loosely packed atoms