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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.
Tin exists in three allotropic forms. Below 18Â°C, the stable form is Î±-tin, or grey tin, with a diamond structure (like carbon, silicon and germanium) and a density of 5.765 g/cc. The lattice constant a = 0.6942 nm, and the melting point is 230Â°C. It is a semiconductor with a band gap of 0.08V.