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1 Allotropes are forms of the same element which exhibit different physical properties. 2  Elements such as carbon, oxygen, phosphorus, tin and sulfur, display allotropy.
The two forms of sulfur are known as Î±-form and Î²-form (the Greek letters alpha and beta, respectively). Both allotropes are yellow, with the Î±-form a brighter yellow and the Î²-form a paler, whitish-yellow. The Î±-form changes to the Î²-form at about 94.5Â°C (202Â°F).