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Discuss the anomalous behaviour of oxyge...

Discuss the anomalous behaviour of oxygen.

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Oxygen shows anomalous behaviour due to small size, high electronegativity and absence of rf-orbitals in valance shell.
Oxygen is diatomic gas while other members are polyatomic solids ,
Oxygen exhibits (-2) oxidation states except in `OF_2`. Rest all members show (+4), (+6) oxidation states.
`H_O` is liquid due to H-bonding while hydrides of other elements do not form H-bonds.
In practise, the covalency of oxygen rarely exceeds two due to absence of rf-orbitals in valance shell while other elements can expand covalency beyond four.
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