Notes on the size of transition-metal atoms

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Abstract
We have examined, as a function of atomic number or outer-electron concentration: (1) atomic volumes of the elemental transition (T) metals and succeeding B-group elements, (2) atomic volumes of mutual solid solutions of the T metals and, (3) apparent atomic volumes of 3d T-metal solutes in T-metal solvents, pointing out features of interest and concern. Secondly, we examine, as a function of the number of d electrons, the radii of ‘divalent’, ‘trivalent’ and ‘tetravalent’ T metals in octahedral anion coordination, derived from compounds with the group-V and -VI elements, P, As, Sb, S, Se and Te. The observed T-metal radii in these pnictides and chalcogenides (both metallic and semiconducting) depend on the number and configuration of the d electrons, and on the symmetry of the anion coordination polyhedron in a manner similar to that observed by others for ionic oxides and halides. No single, simple system of T-metal radii can be suitable for deriving bond numbers in such compounds.

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