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Across
  1. 3. Element with the symbol 'O'
  2. 5. Element used in making glass
  3. 8. The heaviest naturally occurring element
  4. 9. Element used in making batteries
  5. 10. Element used in pencils
  6. 12. The most abundant gas in Earth's atmosphere
Down
  1. 1. Element with the symbol 'Fe'
  2. 2. Element with the symbol 'K'
  3. 4. Element with the symbol 'Na'
  4. 6. Element with the symbol 'Hg'
  5. 7. Element with the symbol 'Ag'
  6. 11. The lightest noble gas