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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 : Existence of an element into more than one physical forms E.g: Coal, lamp black, coke, Diamond, graphite. Allotropy refers to an element, it should be reserved for the different crystalline phases of a given pure element. Polymorphism is a more general term referring also to intermediate phases. Polytypism has a structural meaning: 'Polymorphism' where the polymorphs differ by the stacking sequence of a given type of layers.