Iono-Covalent Character of the Metal–Oxygen Bonds in Oxides: A Comparison of Experimental and Theoretical Data

Abstract

The aim of this paper is to review the actual data on the chemical bond in binary and mixed oxides. The electronegativity (χM) and the acidity pa scales are the most significant semi-empirical concepts for predicting the trend of bonding character in iono-covalent oxides. A satisfactory correlation between the data issued from the acidity scale and the calculated ionic charges has been established.