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A delocalized bond usually involves resonance between different bond types. For example, the double and single bonds of each carbon in a benzene ring resonate between double in single bonds; therefore, the double bonds are delocalized because they are not defined to a certain region.
Delocalized bonds are not constricted to one nucleus as localized bonds are. Resonance structures are a good example of delocalized bonding because as we learned, resonance structures exhibit single/double or single/triple etc character throughout the molecule even though each lewis structure shows the bonds in different positions.
A localized bond pair travels between two atoms. A bond pair that moves between two different pairs of atoms is considered delocalized. You can identify delocalized bonds by checking the electron locations in two different resonance forms; if the pair changes location and form, it is delocalized.
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