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The polarizability of the charge density in the overlap region of a chemical bond has already been correlated to its covalency in diatomic molecules and in lanthanide compounds. This concept has been successfully extended in the present contribution to alkali halide MX (M = Li, Na, K and X = F, Cl, Br) crystals. For more covalent compounds such as silicon, aluminum, and tin oxides the proposed treatment...
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