Essential Chemistry for IGCSE - Structure And Bonding (Section 1 - No. 14)

What are the key differences between the structure of Diamond and Graphite?
Diamond has layers of atoms, graphite does not.
Graphite can conduct electricity and Diamond cannot.
Diamond is hard and graphite is soft.
The carbon atoms in diamond are covalently bonded to four other carbon atoms.

Explanation

Diamond is hard and non-conductive. Graphite is soft and conducts electricity, and in graphite each atom is bonded to three others forming layers.

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