The periodic table

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1234567891011121314151617181920
Across
  1. 4. chemical symbol:Fe
  2. 7. chemical symbol:N
  3. 10. chemical symbol:O
  4. 11. chemical symbol:Pb
  5. 12. chemical symbol:Np
  6. 14. chemical symbol:W
  7. 15. chemical symbol:Xe
  8. 17. chemical symbol:He
  9. 19. chemical symbol:Ni
  10. 20. chemical symbol:K
Down
  1. 1. chemical symbol:U
  2. 2. chemical symbol:H
  3. 3. chemical symbol:Al
  4. 5. chemical symbol:Ar
  5. 6. chemical symbol:Kr
  6. 8. chemical symbol:Na
  7. 9. chemical symbol:Ne
  8. 13. chemical symbol:Pu
  9. 16. chemical symbol:Cl
  10. 18. chemical symbol: Hg