Question

Define delocalisation.

Answer 1

Delocalized electron

Benzene, with the delocalization of the electrons indicated by the circle.

In chemistry, delocalized electrons are electrons in a molecule, ion or solid metal that are not associated with a single atom or a covalent bond.^[1] The term is general and can have slightly different meanings in different fields. In organic chemistry, this refers to resonance in conjugated systems and aromatic compounds. In solid-state physics, this refers to free electrons that facilitate electrical conduction. In Quantum Chemistry, this refers to molecular orbital electrons that extend over several adjacent atoms.