The p-Block Elements

The p-Block Elements

Question

Give Reason:

Dioxygen is a gas while Sulphur is a solid at room temperature.

Answer

Oxygen is smaller in size and thus  due to its small size complete its octet by forming pπ = p bond. Therefore, O2 is a discrte molecule and the intermolecular forces of attraction are weak vander waals forces. Hence, O2 is a gas. While sulphur is large in size, cannot form p= p bonds. Therefore, in order to gain stability, it exists as S8 which is a solid.

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