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Elemental sulfur exists in several different forms. The normal form at room temperature is S8, a ring-shaped molecule with 8 sulfur atoms per ring. However, 6, 7, 12 and 18 membered rings are also possible. If molten sulfur is cooled quickly, it forms a rubbery solid which is thought to be long chains of sulfur atoms arranged in a helical structure. This form is not stable and changes fairly quickly back to the 8-membered rings. Sulfur vapor mostly exists as the diatomic molecule S2.

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16y ago

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