L and M are elements from Period 3 in the Periodic Table. • The oxide formed by L is a solid at room temperature. It has a giant structure. • The chloride of L shows no reaction with water. • Of all the elements in Period 3, only argon has a melting point lower than M. Which formula shows a compound made from L and M?
- A$\text{Al}_2\text{S}_3$
- B$\text{MgS}$
- C$\text{NaCl}$
- D$\text{PCl}_5$