Periodic Table Crossword

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Across
  1. 3. Ar; atomic number 18
  2. 5. atomic number 12, atomic mass 24.305
  3. 8. gas making up most of Earth’s atmosphere
  4. 9. balloons
  5. 10. element that forms the basis of organic life
  6. 11. smells like rotten eggs
  7. 13. component of table salt
  8. 16. used in rechargeable batteries
  9. 17. essential for humans to stay alive
  10. 18. used in computer chips
  11. 19. important for bones and teeth
Down
  1. 1. metalloid used in glassmaking
  2. 2. atomic number 4, second column of the periodic table
  3. 4. found in DNA
  4. 6. gas used in lasers
  5. 7. bananas are known for having
  6. 9. most abundant element in the universe
  7. 12. added to toothpaste
  8. 14. used in cans and foil
  9. 15. used to disinfect pools