science

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Across
  1. 2. Substance has mass and occupies space
  2. 3. amount of matter
  3. 5. Chemical element with symbol C
  4. 7. elements chemically combined
  5. 9. group of atoms bonded together
Down
  1. 1. periodic table item\
  2. 3. elements physically combined
  3. 4. negatively charged particle
  4. 6. the basic unit of matter
  5. 8. positively charged particle