US chemist Gilbert Newton Lewis developed an acid-base theory related to the electron pair.
Lewis acid - is the chemical species that receives the electron pair in a chemical reaction.
Lewis base - is the chemical species that donates the electron pair in a chemical reaction.
Summary table of acid-base theories
Release H + in aqueous solution
Releases OH- in aqueous solution
Donate 1 proton
Receive 1 proton
Get the electron pair
Donate the electron pair