Abstract
Available systems of empirical (crystallographic) ionic radii are compared. All these systems turn out to be compatible if the O2− radius is taken to be 0.140 nm. The choice of the oxygen ionic radius is dictated by the equality of the metal ion-oxygen ion distances in oxide crystals and the metal ion-oxygen atom distances in crystal hydrates and concentrated aqueous solutions. In all systems of empirical ionic radii under consideration, the uncertainty of determination of ionic radii is 0.002–0.005 nm. A new method of determination of the ionic radii of elements in unusual valence states is suggested: from the empirical dependence of the electron density at an atom in a given valence state on the atomic radius, a two-parameter equation relating the ionic radii of Period 4–7 elements in two valence states is derived, which allows one to calculate the ionic radius that cannot be determined by crystallography because of the lack of stable compounds in this valence state. Ionic radii are calculated for all Period 4–7 elements in all valence states. They constitute a nearly complete system of ionic radii. There is a linear relationship between the atomic nucleus charge and the inverse ionic radius. It is shown that the square root of the ionization potential is a linear function of the inverse ionic radius. The as yet experimentally unknown ionization potentials of 78 ions of different elements are estimated.
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Original Russian Text © L.T. Bugaenko, S.M. Ryabykh, A.L. Bugaenko, 2008, published in Vestnik Moskovskogo Universiteta. Khimiya, 2008, No. 6, pp. 363–384.
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Bugaenko, L.T., Ryabykh, S.M. & Bugaenko, A.L. A nearly complete system of average crystallographic ionic radii and its use for determining ionization potentials. Moscow Univ. Chem. Bull. 63, 303–317 (2008). https://doi.org/10.3103/S0027131408060011
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DOI: https://doi.org/10.3103/S0027131408060011