Noun
electron pair (plural electron pairs)
(chemistry, physics) Two electrons having opposite spin but all other quantum numbers the same; i.e two electrons in the same atomic orbital or molecular orbital, especially such electrons that function in concert to form a covalent bond
A Lewis acid is a species that accepts a pair of electrons from another species; in other words, it is an electron pair acceptor. Source: Internet
BF 3 is a Lewis acid because it accepts the electron pair from fluoride. Source: Internet
However, hydrogen chloride, acetic acid, and most other Brønsted-Lowry acids cannot form a covalent bond with an electron pair and are therefore not Lewis acids. Source: Internet
The electron pair from the nucleophile attacks the substrate forming a new bond, while the leaving group departs with an electron pair. Source: Internet
Also, one electron is gained from its bond with the other carbon atom because the electron pair in the C−C bond is split equally. Source: Internet
Lewis did not publish his theory of the cubic atom, but in 1916 it became an important part of his theory of the shared electron pair bond. Source: Internet