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