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Radii of Cu+, Ag+, Au+ and Tl+ cations are determined by the additive method from interatomic distances in molecular and/or crystalline halides, oxides, chalcogenides and cyanides with different coordinations of atoms, and then recalculated for the 6-coordination number. The averaged (from 74 structures) values of revised radii are equal to r(Cu+) = 0.74 Å, r(Ag+) = 0.99 Å, r(Au+) = 0.92 Å, r(Tl+) = 1.22 Å, which are consistent with radii calculated from direct cation–cation contacts in ultimately compressed metals.

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