Chemistry

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Across
  1. 6. A sample of an impure substance.
  2. 7. Neutral charge.
  3. 8. Number of protons and electrons.
  4. 9. Chemically mixed elements.
  5. 12. Size of a particle.
Down
  1. 1. A sample of an pure substance.
  2. 2. Positively charged.
  3. 3. Negatively charged.
  4. 4. A pure substance with one type of atom.
  5. 5. Number of protons.
  6. 10. Smallest part of a compound.
  7. 11. An impure substance.
  8. 13. Smallest part of an element.