Across
- 3. discovered in 9000BC
- 5. natural state is a brown, amorphous brown solid
- 7. semi conductor
- 10. a metalloid
- 11. First metal discovered
- 12. in group 3 in the periodic table
- 13. The 7th most abundant element in the universe
Down
- 1. 3 stable isotopes
- 2. Atomic number is 1
- 3. Greek word "chloros" means yellow green
- 4. discovered in 1807
- 6. soft and have soft luster
- 8. One of the rarest gases on Earth
- 9. Atomic number is 22