Question
Why oxygen is a gas while sulphur is a solid?
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Answer
Oxygen due to its small size and high electronegativity forms $\pi-\pi$ double bond and the intermolecular forces of attraction between oxygen molecules are weak Vander Waals forces so it is gas at room temperature.
Sulphur do not for $\pi-\pi$ multiple bond due to its larger size. It has complex structure. It exists as octa-atomic molecule.
Sulphur do not for $\pi-\pi$ multiple bond due to its larger size. It has complex structure. It exists as octa-atomic molecule.
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