Periodic table

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Across
  1. 1. Clue Ca
  2. 5. Clue O
  3. 7. Clue Au
  4. 10. Clue K
  5. 11. Clue Ar
  6. 12. Clue Ag
  7. 13. Clue Zn
  8. 14. Clue Sn
  9. 15. Clue He
Down
  1. 2. Clue Hg
  2. 3. Clue Na
  3. 4. Clue H
  4. 6. Clue N
  5. 8. Clue Pb
  6. 9. Clue Li