Chemistry

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Across
  1. 3. physical substance that takes up space
  2. 6. the amount an object can hold
  3. 8. small particle
  4. 10. mass the mass of an element
  5. 11. weight
  6. 12. negatively charged
Down
  1. 1. number the total number of protos and neutrons in a nucleus
  2. 2. a positive electric charge
  3. 4. without an electric charge
  4. 5. strongly built and holds its shape
  5. 7. a pure substance consisting of atoms
  6. 8. number the number of protons of an element
  7. 9. a matter that expands freely
  8. 13. a substance that flows freely