Across
- 3. Valuable metal used in catalytic converters
- 4. Inert gas, used in light bulbs
- 6. Used to galvanize steel
- 9. Heavy metal with symbol Pb
- 12. Essential for respiration
- 13. Valuable metal often used in jewelry
- 14. Chemical element with atomic number 1
- 16. Key component of steel
- 17. Lightweight metal used in cans
- 18. Good conductor of electricity
Down
- 1. Gas that creates bright signs
- 2. Makes up majority of Earth's atmosphere
- 5. Liquid at room temperature
- 7. Basis of organic chemistry
- 8. Discovered by Henry Cavendish in 1766
- 10. Reactive gas, used in toothpaste
- 11. Noble gas used in balloons
- 13. Reactive metal in table salt
- 15. Precious metal with symbol Au
- 18. Used to purify drinking water