chem stuff

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Across
  1. 3. eighteenth element on the periodic table
  2. 5. twelfth element on the periodic table
  3. 8. seventh element on the periodic table
  4. 9. second element on the periodic table
  5. 10. sixth element on the periodic table
  6. 11. sixteenth element on the periodic table
  7. 13. eleventh element on the periodic table
  8. 16. third element on the periodic table
  9. 17. eighth element on the periodic table
  10. 18. fourteenth element on the periodic table
  11. 19. twentieth element on the periodic table
Down
  1. 1. fifth element on the periodic table
  2. 2. fourth element on the periodic table
  3. 4. fifteenth element on the periodic table
  4. 6. tenth element on the periodic table
  5. 7. nineteenth element on the periodic table
  6. 9. first element on the periodic table
  7. 12. ninth element on the periodic table
  8. 14. thirteenth element on the periodic table
  9. 15. seventeenth element on the periodic table