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Which allotrope of carbon is the hardest natural substance?

Answer and explanation

Correct answer: Diamond

Diamond is an allotrope of carbon. Each carbon atom is covalently bonded to four other carbon atoms in a three-dimensional network, making diamond extremely hard. In contrast, graphite has layered arrangements of carbon atoms, and the layers can slide over one another, so it is soft.

Related tags

Carbon AllotropesDiamondGraphiteCovalent BondingClass 10 Science

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