Periodic Table, Elements, Compounds, and Molecules

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Across
  1. 3. Ge
  2. 5. C2H4
  3. 10. The number that corresponds to each element in the periodic table
  4. 13. H2O
  5. 14. CO2
  6. 16. The last column in the periodic table
  7. 17. He
  8. 18. A.M.U.
  9. 20. C
Down
  1. 1. FeS2
  2. 2. W
  3. 4. O
  4. 6. O3
  5. 7. The letter or letters that represent an element (e.g. Fe)
  6. 8. Fe
  7. 9. Ne
  8. 11. Au
  9. 12. Ti
  10. 15. Am
  11. 19. S