Across
- 2. atomic # is 19
- 5. natural state is alkali metal
- 6. has 3 stable isotopes
- 8. discovered by joseph black
- 9. 26 neutrons and 222 protons
- 11. one of the rarest gases o earth
- 13. used to make fun powder
- 14. hard brittle crystalline
Down
- 1. solid at a room temperature
- 3. natural state is gas
- 4. fast metal to be discovered
- 7. discovered in 1875
- 10. in romiun era was named cyprus
- 12. poisonous if inhale