Across
- 2. A gas used to fill balloons
- 6. A soft metal found in table salt
- 7. A gas that can make bright glowing signs
- 9. A soft metal used in some batteries
Down
- 1. The most common gas in Earth's atmosphere
- 2. The lightest chemical element
- 3. A metal that burns with a bright white light
- 4. An element found in pencils and diamonds
- 5. A lightweight metal often used to make cans
- 8. A gas that humans need to breathe