Across
- 3. this is the most expensive element
- 4. the only unreactive elements
- 7. this is the gas we breathe out
- 8. this is a halogen used in swimming pools
- 9. this is made by reacting calcium and fluorine
- 10. the gas required for burning
- 11. this is the most reactive metal
- 13. this is the most common solvent
- 14. burns with a bright white light
Down
- 1. this gas burns with a pop
- 2. the lead in the pencil
- 5. this is the chemical name for salt
- 6. strong and light and is used to make aircraft
- 12. the name of group one on the periodic table
- 15. this metal rusts