Across
- 2. Makes up most of Earth's atmosphere
- 5. Lightweight, corrosion-resistant metal
- 6. Basis of all known life
- 8. Light metal used in batteries
- 9. Component of DNA and fertilizers
- 13. Lightest element, makes up most of the universe
- 14. Noble gas used in balloons
- 16. Element in borax and used in detergents
- 17. Lightweight metal used in fireworks
- 19. Essential nutrient for plants and humans
Down
- 1. Found in computer chips and sand
- 3. Noble gas used in signs
- 4. Essential for bones and teeth
- 7. Used to disinfect water
- 10. Essential for respiration
- 11. Strong, lightweight metal used in aerospace
- 12. Highly reactive halogen
- 15. Common reactive metal, used in table salt
- 18. Yellow nonmetal used in matches
- 20. Noble gas used in light bulbs