The phenomenon of the existence of a chemical element in two or more forms differ in physical properties but of the same chemical nature is known as Allotropy. Carbon has two major allotropes diamond and graphite and the third one is Buckminsterfullerene. Diamond has a three-dimensional network of covalent bonds and is hard. In graphite, the carbon atoms are arranged in flat parallel layers as regular hexagons resulting in soft and ________ nature.

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The correct answer is slippery.

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