Three successive elements $X$, $Y$ and $Z$ lie in the third period of the Periodic Table. Of these three, element $Y$ has both the greatest first ionisation energy and the lowest melting point. What are the possible identities of $X$, $Y$ and $Z$?
- Asodium, magnesium, aluminium
- Bmagnesium, aluminium, silicon
- Caluminium, silicon, phosphorus
- Dsilicon, phosphorus, sulfur