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Lewis identified acids and bases by their ability to accept or donate:
AAn electron pair
BA single proton
CA whole neutron
DAn entire atom
Answer & Solution
Correct answer: A. An electron pair
1. Lewis generalised the acid-base idea beyond protons.
2. Lewis proposed a generalized definition of acid-base behavior.
3. In it, acids and bases are identified by their ability to accept or to donate a pair of electrons.
4. Doing so forms a coordinate covalent bond.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 15 'Equilibria of Other Reaction Classes', sections 15.1-15.3_
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