Across
- 3. Noble gas used in lighting and welding
- 5. Lightweight metal for alloys and fireworks
- 8. Makes up most of Earth’s atmosphere
- 9. Noble gas in balloons
- 10. Basis of life, found in diamonds
- 11. Yellow element with a pungent smell
- 13. Soft metal reacting violently with water
- 16. Soft metal in batteries
- 17. Essential for respiration
- 18. Semiconducting metalloid
- 19. Essential for bones and teeth
Down
- 1. Metalloid in borax and detergents
- 2. Lightweight metal used in aerospace
- 4. Essential for DNA and fertilizers
- 6. Noble gas glowing in signs
- 7. Soft metal essential for plants and nerves
- 9. Lightest element, fuels stars
- 12. Highly reactive halogen
- 14. Silvery metal used in cans and foil
- 15. Disinfecting halogen gas