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one of at least two different forms of an element. Different allotropes of a substance often have very different [properties] from each other; e.g. [white phosphorus] (P4) is a highly reactive and toxic substance that glows in air due to its high reactivity and possesses a molecular structure, while red [phosphorus] (the stuff used to make strikers on match boxes) is a non-toxic substance that has a polymeric structure.
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