Allotropy is the property of some chemical elements to exist in two or more different forms, in the same physical state, known as allotropes of the elements
Example : Allotropes of carbon: Diamond, Graphite and Buckminsterfullerene.
Examples of allotropes
Carbon provides one of the best examples of allotropy.
Three important allotropes of carbon are diamond, graphite, and fullerenes.
Black, white and red phosphorus are the allotropes of phosphorus.