• Each carbon atom is covalently bonded to three other carbon atoms. The layers are held together by weak dispersion forces. The network structure contains delocalized electrons.

• Properties: solid with a high melting point (due to the strong covalent bond between atoms), conducts electricity (delocalised electrons), brittle (layers can be disturbed by the slightest disturbance).

Diamond

• Diamond is made up of carbon atoms that bond with four adjacent carbon atoms forming a covalent lattice.

• Properties: very hard, non conductive.

Graphite and Diamond are allotropes of carbon. These are different physical forms of the elements carbon.