Which of the following property makes oxygen different from other group members?
Small Size
High Electronegativity
Non-availability of d-orbital
All of these
As we have learnt,
Anomalous behaviour of oxygen is due to
(1) its small size
(2) its high electronegativity
(3) its high ionisation energy
(4) absence of d orbitals in the valence shell
Therefore, option (4) is correct.