cemistry puzzle

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Across
  1. 4. table
  2. 6. solution
  3. 8. behavior
  4. 11. partner
  5. 13. dot
  6. 14. sodium
  7. 15. oxygen
Down
  1. 1. beryllium
  2. 2. lithium
  3. 3. element
  4. 5. atom
  5. 7. collid
  6. 9. dioxide
  7. 10. word
  8. 12. diagram