Chemistry Terms

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Across
  1. 3. number of protons and neutrons in an atom
  2. 4. has negative charge
  3. 7. number of protons in an atom
  4. 8. contains more that one type of atom
  5. 12. the smallest part of a compound
  6. 13. an impure substance containing different elements
Down
  1. 1. has positive charge
  2. 2. the mass of a particle
  3. 5. contains only one type of atom
  4. 6. has neutral charge
  5. 9. 2 or more elements which are chemically combined with a fixed ratio
  6. 10. a pure substance that only contains one type of atom
  7. 11. The smallest part of an element