Which feature of graphene allows it to conduct electricity?

The ability of graphene to conduct electricity is primarily due to the presence of delocalised electrons. In graphene, each carbon atom is bonded to three other carbon atoms, which allows for a unique arrangement of the carbon atoms in a two-dimensional plane. This structure results in one electron from each carbon atom being free to move around within the lattice. These delocalised electrons can carry an electric charge across the material, enabling graphene to conduct electricity with high efficiency.

The other features mentioned do not contribute to graphene's electrical conductivity. Protons are part of the atomic structure but do not play a role in conduction. While the high density of carbon atoms contributes to the overall strength and stability of graphene, it does not directly influence its conductivity. Additionally, graphene lacks metallic bonds; instead, it has covalent bonds that create a strong network but do not facilitate the movement of electrons in the same way that metallic bonds do in metals. Therefore, the presence of delocalised electrons is the key feature that allows graphene to conduct electricity effectively.