chemistry

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Across
  1. 6. the amount of protons in an element
  2. 7. impure
  3. 9. the amount of protons and neutrons
  4. 11. negatively charged that orbits the nucleus
  5. 12. pure substance that only contains 1 type of atom
Down
  1. 1. chemically bonded elements
  2. 2. an impure substance
  3. 3. the size of the particle
  4. 4. pure
  5. 5. the smallest part of an element with the same properties
  6. 8. positively charged in the nucleus
  7. 9. the smallest part of a compound
  8. 10. neutral charged in the nucleus