Matter corssword puzzle

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Across
  1. 3. the quantity of matter
  2. 4. the amount of space a substance occupies
  3. 6. basic unit of a chemical element
  4. 7. a group of atoms bonded together
  5. 10. something that is firm and is not a liquid
Down
  1. 1. a substance that expands freely
  2. 2. a particular kind of matter
  3. 3. substance that takes up space and has mass\
  4. 5. a pure substance consisting of only atoms
  5. 8. substance that flows freely and
  6. 9. the study of matter and substances