Introduction of a new reaction family involving lone electron pairs
forming single bonds

Example reaction: Acatat ion (CH3CO2-) reacting with water (H2O)

In both of the two contributing resonance structures of the Acetat ion
one of the two oxygen atoms is connected to the carbon atom by a single
bond and bears three lone electron pairs while the other oxygen atom is
connected by a double bond and bears two lone electron pairs. The oxygen
atom with three lone electron pairs can abstract a proton (H+) from a
water molecule where one of the three lone electron pairs provides both
electrons for the new single bond formed to the new hydrogen atom,
resulting in an acetic acid (CH3COOH) and a hydroxide (OH-) molecule.