Question

why non metal graphite have cinduct electricity

Answer 1

Graphite is an allotrope of carbon (as is diamond). It displays properties of both metals, and nonmetals. However, like a metal, graphite is a very good conductor of electricity due to the mobility of the electrons in its outer valence shells.


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Answer 2

This is because only 3 of the available valence electrons form covalent bonds leaving 1 spare electron, which then becomes delocalised. This delocalised electron is no longer associated with one particular carbon atom and it is able to move freely between the carbon layers of graphite and conduct electricity.