Why is oxygen a gas and Sulphur a solid ?

oxygen exists as a diatomic molecule while sulphur exists as a polyatomic molecule hence sulphurs  mass will be more therefore it will have more van der waal forces,hence more boiling point.

inother words diatomic oxygen ,will have less boiling point therefore it is present in gaseous state 

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as oxygen is diatomic but sulphur is polyatomic thus making it more denser

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