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A Lewis Base is an electron pair donor, and a Lewis Acid is an electron pair acceptor. This classification of acid or base is not determined by a resonance structure of a molecule, but rather is based upon atoms compose the molecule, cation, or anion, and their likelihood to keep or donate electrons. Cations and compounds containing cations, are Lewis Acids because they can accept elections, while anions, or molecules with full octets tend to be Lewis Bases because they can donate elections in a reaction.
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