Show anomalous behaviour of oxygen, Chemistry

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Q. Show Anomalous Behaviour of Oxygen?

Oxygen differs considerably from the rest of the family members. Small size, very high electronegativity and non-availability of d-orbitals in the valence shell are the factors responsible for these differences. The main differences are as given below:

Oxygen is a gas while other members are solids.
Oxygen is diatomic whereas rest of the members are polyatomic.
Being highly electronegative, oxygen shows only negative oxidation states of -2 and -1 except in OF₂, in which its oxidation state is +2.
It shows paramagnetic behaviour in gaseous, liquid and solid states.
Oxygen has a tendency towards extensive hydrogen bond formation. H₂O is a
Liquid, whereas hydrides of the other elements of this group are gases.

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