Electronegativities polarizability and

Taft and Topsom developed a detailed analysis of the role that substituent effects play in properties such as acidity and basicity. The four primary kinds of substituent effects were considered to be electronegativity (induction), field, resonance, and polarizability effects. As in the Hammett equation, the a values are substituent properties, while the p values represent the sensitivity of the reaction to each of these properties. The general form of such an equation is given in equation 6.95, where the symbols F, x, / and R represent field, electronegativity, polarizability, and resonance effects, respectively. 

Rosseinsky DR (1994) An electrostatics framework relating ionization potential (and electron affinity), electronegativity, polarizability, and ionic radius in monatomic species. J Am Chem Soc 116 1063-1066... 

Wj are various weighting factors (such as atomic masses, van der Waals volumes, electronegativities, polarizabilities, and electrotopological indices) ... 

The magnitude of 8 Q depends on the differences in atomic electronegativities, polarizabilities and valence densities. The effect of different electronegativities has been considered in the calculation of dissociation energy and is introduced here for a single electron as... 

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