chemistry crossword puzzle

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Across
  1. 1. Bonds
  2. 5. one type of atom
  3. 7. measurement
  4. 9. metallic material
  5. 11. fundamental building block
  6. 12. Table
Down
  1. 2. Compound
  2. 3. can be separated by physical methods
  3. 4. mass
  4. 6. measure of the amount of matter
  5. 8. measurement
  6. 10. chemically bonded