Elemants and Compounds

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Across
  1. 3. semiconductors
  2. 7. smallest unit of an element
  3. 9. reversible
  4. 10. air
  5. 12. 1 or 2 letter abbreviation
  6. 13. pure substance
  7. 14. oceans
  8. 15. mass divide by volume
Down
  1. 1. color shape length
  2. 2. not reversible
  3. 4. on the right side of the periodic table
  4. 5. living matter
  5. 6. solid earth
  6. 8. most elements are this
  7. 11. pure substance composed of two or more elements