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When we draw Lewis structures, we draw some bonds as single bonds and others as double bonds for the sake of simplicity; however, experimental bond lengths show us that extra electrons that make up double bonds simultaneously exist in the orbitals of all the bonds for that atom. Resonance structures are a blend of all the possible structures we could draw.
Single and double bonds are drawn in Lewis dot structures, but those bonds are capable of being different equivalent locations. Electrons move around so that actual bond length is equal, representing the average bond length of the structure. This is represented in resonance.
The structures have equal bond length because of resonance blending; we give the structures a single or double bond to simplify it. However, the real structure is an average of all the possibilities where each bond is the same length.
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