Periodic table crossword

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Across
  1. 3. Chemical symbol of "He"
  2. 6. Chemical symbol of "O"
  3. 7. Heavy metal with the symbol "Pb"
  4. 10. A yellow element used in jewelry
  5. 11. Chemical symbol of "C"
  6. 12. Chemical symbol of "Na"
  7. 13. The gas that makes up most of the atmosphere
  8. 14. Chemical symbol of "Fe"
  9. 15. The element with the symbol "Hg"
Down
  1. 1. Chemical symbol of "Ag"
  2. 2. A noble gas with the symbol "Ne"
  3. 4. Chemical symbol of "Cl"
  4. 5. Most abundant element in Earth's crust
  5. 8. The symbol "Al" represents this metal
  6. 9. The first element in the Periodic Table