Explain Graphite and Graphene in terms of Covalent Structure

-Graphite is black, and opaque. -The Carbon atoms hear only create 3 Covalent Bonds, which means the 4th Electron that isn't used can be Delocalised [Free] and with it creating an Electric Charge -Sheet Formation happens also, that can Slide on each other -Those layers are held Weakly, so that they can be broken off and leave a Black Mark. That is how you can write with a pencil. -Like with the Diamond, it has a High Melting/Boiling Point because of the Covalent Bonding -Graphene is the Single Sheet, and its Very Strong, Thin, Transparent and Light. The Delocalised Electrons here are even more 'Freeer' than the Graphite's ones, so it can conduct better