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Delocalized electrons are spread across more than one atom or shared. Think of it as an electron probability cloud spread over the entire molecule or between two atoms at any given moment the moving electron could be anywhere in that cloud. In one instant it could be forming bonds with one atom and in another instant it could be forming bonds with a different atom. The resonance structures represent the different instances in which the electron could be found and the bonds it could form. in the example below in any given instant the electron could be found forming a pi bond with one oxygen or the other.
Delocalization occurs when there is resonance. For example, if there are two resonance structures--one with a single bond between 2 atoms and one with a double bond between two atoms, there won't be exactly 2 or 4 electrons bonded in that area. The electrons aren't specifically associated with these bonds.
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