Why does graphite conduct electricity?

Answer and explanation

Correct answer: A. It has delocalised electrons between its layers

Each carbon atom uses three electrons for bonding, so the fourth is free to move along the layers.
Answer: It has delocalised electrons between its layers.
Why not the others: It contains free ions: graphite contains no ions. Its atoms are charged: its atoms are neutral. It has a giant ionic lattice: graphite is a covalent structure.

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