Periodic table crossword puzzle

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Across
  1. 5. The symbol is N
  2. 8. The symbol is Zn
  3. 12. The symbol is F
  4. 13. The symbol is Na
  5. 16. The symbol is Hg
  6. 18. The symbol is Li
  7. 19. The symbol is S
  8. 20. The symbol is P
  9. 22. The symbol is Br
  10. 25. The symbol is Pb
  11. 27. The symbol is Cl
  12. 29. The symbol is Co
  13. 30. The symbol is Ca
  14. 31. The symbol is Mg
  15. 33. The symbol is Au
  16. 35. The symbol is Xe
Down
  1. 1. The symbol is Be
  2. 2. The symbol is Sn
  3. 3. The symbol is Rb
  4. 4. The symbol is Kr
  5. 6. The symbol is Si
  6. 7. The symbol is He
  7. 9. The symbol is Cd
  8. 10. The symbol is As
  9. 11. The symbol is K
  10. 14. The symbol is Ar
  11. 15. The symbol is B
  12. 17. The symbol is Cu
  13. 21. The symbol is Ag
  14. 23. The symbol is Se
  15. 24. The symbol is Pt
  16. 26. The symbol is I
  17. 28. The Symbol is H
  18. 32. The symbol is Ni
  19. 34. The symbol is O