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| If the hydrogen atoms are stripped from a benzene molecule (making a "phenyl group") this unit can be connected together into sheets of "graphene."
The bonding is the same: The first three carbon bonding electrons are tied up in sigma sp2 bonds, the fourth electron is in a pi configuration. The pi electrons can again bridge together to form pi bonds. And as the pairings change, a continuous moving cloud of pi electrons forms above and below the graphene plane. This movement of pi electrons means that graphene can also conduct electrical current.
(Click "Toggle Bonds" to see alternate depictions of the bonding electrons. Drag the mouse slowly over the model to move it.)
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