In chemistry, resonance refers to a concept used to describe the delocalization of electrons within molecules that can be represented by two or more valid Lewis structures (also known as resonance structures or contributing structures). These structures depict different arrangements of electrons, primarily in π (pi) bonds and non-bonding lone pairs, while keeping the positions of the atomic nuclei the same. Resonance is important because no single Lewis structure can fully capture the actual electronic structure of the molecule.
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