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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 (from Greek á¼Î»Î»Î¿Ï (allos) , meaning other, and ÏÏÏÏÎ¿Ï (tropos) , meaning manner, form) is the property of some chemical elements to exist in two or more different forms, in the same physical state, known as allotropes of these elements.or some elements, allotropes have different molecular formulae which can persist in different phases â for example, two allotropes of oxygen (dioxygen, O 2, and ozone, O 3), can both exist in the solid, liquid and gaseous states.