Periodic Table

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1234567891011121314151617
Across
  1. 5. The first element, a light gas
  2. 7. The element with atomic number 14, used in computer chips
  3. 8. A noble gas used in balloons
  4. 10. Element essential for life; atomic number 6
  5. 13. A gas that is a diatomic molecule, atomic number 9
  6. 14. An alkali metal, atomic number 11
  7. 15. A non-metal with atomic number 16
  8. 16. A halogen with atomic number 17
Down
  1. 1. A light metal, atomic number 12
  2. 2. A metalloid often used in glass
  3. 3. A non-metal essential for life, atomic number 15
  4. 4. An alkaline earth metal, atomic number 4
  5. 6. A gas essential for life, atomic number 7
  6. 9. A noble gas with atomic number 10
  7. 11. A post-transition metal with atomic number 13
  8. 12. An alkali metal with atomic number 3
  9. 17. The element with atomic number 8, essential for respiration