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Oxygen is divalent in its compounds, but...

Oxygen is divalent in its compounds, but sulphur is even hexavalent. Why?

Text Solution

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Ground state configuration of oxygen has two orbitals with unpaired electrons. It forms two bonds. Oxygen cannot expand its valencies due to absence of valence d - orbitals.
Sulphur forms 4 bonds in the first excited state and 6 bonds in the second excited state.
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