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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.
Allotropy (or allotropism) is when a chemical element can exist in two or more different forms in the same physical state or phase. These different forms are called allotropes. Therefore, an allotrope is a different structure in which an element appears. This happens when the atoms of the element are bonded together in a different way. For example, the allotropes of carbon include: 1  diamond, where the carbon atoms are bonded together in a four-cornered lattice arrangement; 2  graphite, where the carbon atoms are bonded together in sheets of a six-sided lattice; 3  graphene, single sheets of graphite; and.