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Who introduced the Lewis theory of acids and bases?

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The Lewis theory of acids and bases was introduced in 1923 by the American physical chemist Gilbert N. Lewis.12

In this framework, a Lewis acid is defined as any compound capable of accepting an unshared pair of electrons during a chemical reaction, while a base is defined as a molecule that provides that electron pair. This generalization expanded the understanding of acid–base chemistry beyond earlier definitions that focused primarily on hydrogen ions.13