Matter

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Across
  1. 1. cylinder
  2. 4. nucleus
  3. 6. degree of compactness of a substance.
  4. 8. A group of atoms bonded together
  5. 9. atom's central core, containing protons
  6. 10. unit of matter
  7. 12. a small particle in the nucleus of the atom, with
Down
  1. 2. nucleus
  2. 3. negatively charged particle
  3. 4. of space occupied by an object
  4. 5. to measure the volume of a liquid
  5. 7. charged particle
  6. 11. atom's central core, containing protons and neutrons.
  7. 13. electrical charge