In terms of this quantity, the hydrohelium cation is the strongest known acid.
In the Morokuma decomposition, roughly two-thirds of this quantity originates from electrostatic and delocalized-electron interactions, and the exchange repulsion term is zero. In amines, the increase in this quantity with increasing alkyl substitution arises mostly from a polarizability term. In polysubstituted benzenes, increments in this quantity are large and negative for non-methyl substitution at at the ipso position, and are governed by an additivity rule. In terms of this quantity, the hydrohelium cation is the strongest known acid. This quantity is the energy released when benzene is converted to arenium in the gas phase. Constituting part of the (*) Bronsted-Lowry definition of basicity, for 10 points, name this quantity, the amount of energy released when a hydrogen cation is added to a molecule or anion in the gas phase.
In the Morokuma decomposition, roughly two-thirds of this quantity originates from electrostatic and delocalized-electron interactions, and the exchange repulsion term is zero.
proton affinity [accept Epa]