"Does the carbonate ion have one uncharged oxygen atom bound to carbon through a double bond and two other oxygen atoms bound through a single bond each, both bearing a negative charge, as suggested by the Lewis structures? Or, to put it differently, are A, B, and C equilibrating isomers? The answer is no... It is said to be delocalized, in accord with the tendency of electrons to “spread out in space”. In other words, none of the individual Lewis representations of this molecule is correct on its own. Rather, the true structure is a composite of A, B, and C. The resulting picture is called a resonance hybrid."
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K. Peter C. Vollhardt, Neil E. Schore (2011) Organic chemistry : structure and function 6th ed. Chapter 1. Structure and Bonding in Organic Molecules
https://en.wikiquote.org/wiki/Resonance_(chemistry)
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Resonance (chemistry)
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