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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.
An allotrope should not be confused with an isotope, which differs at the atomic, rather than molecular, level. There are two types of allotrope. The enantiotropic type can undergo a reversible change into another allotrope under certain conditions, such as different temperature or pressure.