i. Some elements occur in nature in more than one form.
ii. The chemical properties of these different forms are the same but their physical properties are different. This property of elements is called allotropy.
iii. Like carbon, sulphur and phosphorus also exhibit allotropy.
iv. The different forms of the element are called allotropes.
The allotropes of carbon are classified into two types
i. Amorphous forms – coal, coke, wood, charcoal, animal charcoal etc.
ii. Crystalline forms – diamond, graphite, and fullerene
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