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Wikipedia definition
1. Resonance (chemistry)In chemistry, resonance or mesomerism is a way of describing delocalized electrons within certain molecules or polyatomic ions where the bonding cannot be expressed by one single Lewis formula. A molecule or ion with such delocalized electrons is represented by several contributing structures (also called resonance structures or canonical forms).
Read “Resonance (chemistry)” on English Wikipedia
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Read “Resonance (chemistry)” on DBpedia

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