X, Y and Z are three neighbouring elements in Period 3 of the Periodic Table. Element Y has the highest first ionisation energy and the lowest melting point of the three. What are the identities of X, Y and Z?
- AX: $\text{Na}$, Y: $\text{Mg}$, Z: $\text{Al}$
- BX: $\text{Mg}$, Y: $\text{Al}$, Z: $\text{Si}$
- CX: $\text{Al}$, Y: $\text{Si}$, Z: $\text{P}$
- DX: $\text{Si}$, Y: $\text{P}$, Z: $\text{S}$