Question

Diamond is an another allotrope of carbon. What does allotrope in the above sentence mean ?

Answer 1

elements can exist in different physical forms,but chemical properties are identical.these form of an element is called allotrope.diamond,graphite & fullerines are allotropes of carbon.
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Answer 2

The term allotrope refers to one or more physical forms of a chemical element that occurs in the same physical state.Diamond, graphite and fullerenes (substances that include nanotubes and 'buckyballs' , such as buckminsterfullerene) are three allotropes of pure carbon.