<P> 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 . 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 orbitals that extend over several adjacent atoms . </P> <P> In the simple aromatic ring of benzene the delocalization of six π electrons over the C ring is often graphically indicated by a circle . The fact that the six C-C bonds are equidistant is one indication of this delocalization . In valence bond theory, delocalization in benzene is represented by resonance structures . </P>

Why are metals described as having a sea of electrons