Across
- 2. Largest nucleus
- 3. Most common element
- 5. Used in incandescent light bulbs
- 8. Densest element
- 9. What we breathe
- 11. In computer chips
- 12. Smallest nucleus
Down
- 1. Newest element
- 4. 75% of air
- 6. ____ signs
- 7. Makes life and diamonds
- 10. Melts in your hand