STANDARD 7

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Across
  1. 3. the subatomic particles that take part in a chemical reaction.
  2. 4. a pure substance that cannot be broken into any simpler form.
  3. 7. the gas evolved during a reaction.
  4. 8. number the number of protons present in an atom
  5. 10. the abbreviation for the name of an element.
Down
  1. 1. number- the number of protons and neutrons of an atom.
  2. 2. the combining capacity of an element with other elements.
  3. 5. the subatoic particle with negligible mass.
  4. 6. the substances formed during a chemical reaction.
  5. 9. a charged atom.