periodic table puzzle

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Across
  1. 8. what has the symbol N?
  2. 9. what elements has the symbol of cf?
  3. 11. what has the symbol Ne?
  4. 13. what has the symbol Cl?
  5. 14. What elements has the symbol Fe?
  6. 17. what has the symbol of Ag?
  7. 18. what has the symbol I?
  8. 19. what elements has the symbol He?
Down
  1. 1. what elements has the symbol of H?
  2. 2. what elements has the symbol of K?
  3. 3. what has the symbol Cu
  4. 4. what elements has the symbol of Tl?
  5. 5. what elements has the symbol of Y?
  6. 6. what elements has the symbol of po?
  7. 7. what has the symbol C?
  8. 8. what elements has the symbol of Ni?
  9. 10. what has the symbol S?
  10. 12. what has the symbol Ni?
  11. 15. what elements has the symbol of O?
  12. 16. what elements has the symbol of zr?
  13. 17. what elements has the symbol of Na?