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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.
1 Elements such as carbon, oxygen, phosphorus, tin and sulfur, display allotropy. 2  The different physical properties displayed by allotropes of an element are explained by the fact that the atoms are arranged into molecules or crystals in different ways. is a linear molecule while O 3 is a bent molecule. 2 and O 3 have different physical properties such as colour, odour, melting and boiling point, density and solubility. Some properties of the allotropes of oxygen are shown below: The two most common, naturally occurring allotropes of carbon are graphite and diamond.