Graphite is a good conductor - explain.

Explanation

Graphite consists of a layer structure having an hexagonal arrangement of carbon atoms. Each carbon atom is `sp^2` hybridized and connected to three more carbon atoms by sigma bonds.
Hexagonal structures in each layer are connected to each other through the weak overlap of fourth electron present on each carbon atom perpendicular to the molecular plane.
Weak overlap leads to the formation of band structure which is half filled and half empty, thus responsible for free motion of electron.
Hence graphite acts an electrical conductor. However it may be noted that metal is a 3D- conductor, but graphite is a 2D- conductor.