Across
- 3. discovered by Carl Wilhelm Scheel.
- 4. It was discovered by Andres Manuel del Rio.
- 6. Was discovered in 1894 by William Ramsay.
- 7. use to make gunpowder
- 8. It is the 6th most abundant element on earth
- 9. Discovered in 1875 by a French chemist Paul- Emile Lecoq de Boisbaudran
- 10. Discovered in 9000BC By THE Mesotopians
- 12. Has 22 protons
- 13. has the heighest melting point of all metalloids
Down
- 1. colorless gas and odorless
- 2. Its natural state is a metal
- 5. discovered in 1755
- 7. Atomic mass is 78.971
- 11. Has a Atomic mass of 28.085