Allotropes: Structure Sets Property
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State
Allotropes are different structural forms of the same element in the same physical state, their differing bonding arrangements alone accounting for differing properties.
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Diamond's 3D network of single bonds is extremely hard, while graphite's weakly stacked layers are soft and slippery.
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Treating diamond and graphite as two different compounds, rather than one element in different structural forms, misreads what allotropy means.