Periodic table

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Across
  1. 1. Element abbreviated as Cl
  2. 6. Element abbreviated as Ca
  3. 7. Element abbreviated as S
  4. 8. Element abbreviated as K
  5. 10. Element abbreviated as Mg
  6. 14. Element abbreviated as Ne
  7. 15. Element abbreviated as H
  8. 17. Element abbreviated as F
  9. 19. Element abbreviated as O
  10. 20. Element abbreviated as Na
Down
  1. 2. Element abbreviated as Li
  2. 3. Element abbreviated as Be
  3. 4. Element abbreviated as He
  4. 5. Element abbreviated as C
  5. 9. Element abbreviated as Al
  6. 11. Element abbreviated as Si
  7. 12. Element abbreviated as P
  8. 13. Element abbreviated as N
  9. 16. Element abbreviated as Ar
  10. 18. Element abbreviated as B