Across
- 3. Chlorine fluorine bromine
- 7. Group 1 metal used in batteries
- 8. Greenish yellow gas
Down
- 1. Third most reactive group 1 metal
- 2. This noble gas is radioactive.
- 4. Group 1 metals are also known as ______ metals.
- 5. Fully filled valence shells. _____ gases.
- 6. Makes up 1% of the earth's atmosphere