Answer
See work below for details.
Work Step by Step
Graphite’s structure consists of flat sheets of carbon atoms bonded together as interconnected hexagonal rings. The electrons in the extended pi bonding network within a sheet make graphite a good electrical conductor in the direction of the plane of the sheets. But diamond is not a good electrical conductor, because it is an extremely strong network covalent solid, where all of the carbon atoms are covalently bonded, and no electrons are free to conduct electricity.
