Hardness and Electric Dipole Polarizability

Abstract

Pearson, in 1963, classified the Lewis acids and bases in terms
of "hardness".  A less polarizable species is hard and more
polarizable is soft This proved to be quite successful in rationalizing
a variety of chemical observations, especially the exchange reactions.
In the present work, a relation  between hardness and
polarizability has been found, which is further used to calculate the
electronegativity of various atoms. It is interesting to note that these
calculated values are very close to the experimental values. Further
the electrostatic potentials of various atoms have been calculated
and compared with the experimental values for better agreement.