Jl. Reed, ELECTRONEGATIVITY - CHEMICAL HARDNESS .2., The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, 101(40), 1997, pp. 7401-7407
The identification of the absolute hardness of density functional theo
ry with chemical hardness has proven to be problematic. A rather detai
led examination of absolute hardness has revealed that it is in confli
ct with the commonly accepted interpretation of chemical hardness. To
examine chemical hardness in detail, an operational definition has bee
n proposed that gives rise to an interpretation of chemical hardness,
which is consistent with that of absolute hardness.