Answer:
(b)
The element is phosphorus. It has stable configuration as outermost p-orbitals
are half filled. The element (d)also belongs to group 15, but its ionisation
enthalpy is less than phosphorus as its atomic radius is higher than phosphorus.
The element (a) is alkali metal and element (c) is a member of group 14 i.e.,
silicon.
You need to login to perform this action.
You will be redirected in
3 sec