Across
- 6. When I am freshly exposed to air, I exhibits a metallic lustre.
- 7. I am a precious metal that is extremely valuable.
- 9. I am the only metalloid in the Boron family.
- 11. I am the most common element in the atmosphere.
- 12. I am located in group 2 and I have a high boiling point.
- 13. I am essential for life on Earth.
- 15. I have an atomic mass of 47.90.
- 17. When I react with aluminum, a purple gas is produced.
- 19. I am used to make fireworks.
- 20. Jupiter's moon Io owes its colors to various forms of me.
Down
- 1. I am extremely flammable and and I am used to create balloon structures.
- 2. I have the atomic number of 20.
- 3. I am part of the Alkali family and I am never found in nature.
- 4. I am located in the Carbon family and I have a low melting point.
- 5. I am the most common element in the universe.
- 8. My atomic mass is 83.80.
- 10. Steel wool burns when exposed to me.
- 14. I am found in most meteorites and a coin in America is named after me.
- 16. People used to put me on top of hats.
- 18. I am a noble gas that is used in neon signs to create the color orange-red.