Delocalized Electron Definition: A delocalized electron is an electron in a atom, ion or molecule not associated with any single atom or a single covalent bond.Delocalized electrons contribute to the conductivity of the atom, ion or molecule.Materials with many delocalized electrons tend to be highly conductive.elocalized Electron Definition: A delocalized electron is an electron in a atom, ion or molecule not associated with any single atom or a single covalent bond.