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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.
Oxygen (O 2) and ozone (O 3) are examples of allotropes (from the Greek meaning in another manner). By definition, allotropes are different forms of an element. Because they have different structures, allotropes have different chemical and physical properties (see table below).xygen (O 2) and ozone (O 3) are examples of allotropes (from the Greek meaning in another manner). By definition, allotropes are different forms of an element. Because they have different structures, allotropes have different chemical and physical properties (see table below).