Thesubstancewhichconductscurrentin the solid state is –

Thestructureofgraphiteisunlike most other network substances. It is formed in 'sheets'ofcarbonatoms,eachofwhichisbonded toonlythreeothers.Thefourthvalenceelectron of the carbon atomis delocalized and can move between the different layers, therefore carrying an electrical charge through the network of carbon atoms, a conductor is a material which contains movable electric charges. Unlike diamond (another carbon allotrope), graphite is an electrical conductor, a. semimetal.