Abstract
Evidence for the existence of multiple bonding due to d-electron donation by non-inert gas type ions is discussed briefly. A quantitative relation between the heats of formation of binary halides and chalcides containing non-inert gas type cations, on the one hand, and inert gas type cations, on the other, reveals an enhanced lattice energy in the former class of compounds. It is shown that this may be accounted for in the case of iron group elements without recourse to the postulate of participation of d-electrons in the bonding, as satisfactory estimates of the lattice energies of halides and sulphides may be made on the basis of values for group IIa compounds.

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