Across
- 3. - Only metal that's liquid at room temperature
- 7. - The lightest element
- 9. - Noble gas in neon signs
- 11. - Found in steel
- 13. - Historically used in pipes
- 14. - Reacts explosively with water
Down
- 1. - Essential for human respiration
- 2. - Precious metal in jewelry
- 4. - Used in water purification
- 5. - Used in nuclear reactors
- 6. - Basis of organic chemistry
- 7. - Used in party balloons
- 8. - Valuable precious metal
- 10. - Makes up the majority of Earth's atmosphere
- 12. - Used in computer chips