Why when a chemical species is stablized by resonance, its energy

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Why when a chemical species is stablized by resonance, its energy level is lower? As I know, resonance is only a kind of electrons delocalization within the species. There is no interaction between that species and the environment.
 

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Stabilization is equivalent to lowering the energy. Conceptually, you can think of the charge being more evenly distributed when the electrons are delocalized---thus decreasing the electrostatic repulsion between like-charges, and better saturating between opposite charges (i.e. nuclei and electrons).
These processes don't require any interaction with the environment.
 

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