Chemical Science revision

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Across
  1. 3. The particle responsible for a negative charge
  2. 4. A substance made of two or more elements chemically bonded.
  3. 7. The starting materials in a chemical reaction.
  4. 9. The ending materials in a chemical reaction.
Down
  1. 1. A particle with no charge found in the nucleus.
  2. 2. A substance made of only one type of atom.
  3. 5. The particle responsible for a positive charge.
  4. 6. A change where no new substance is formed.
  5. 8. The smallest unit of an element.