my lab vocab crossword puzzle

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Across
  1. 2. two or more elements combined
  2. 3. small
  3. 7. has elements on it
  4. 9. pure substance
  5. 10. mixing substances together
Down
  1. 1. a set of symbols
  2. 4. everything
  3. 5. chemical unit
  4. 6. the number of atoms
  5. 8. the number in front of a chemical formula