[en] Ab initio plane wave based density functional theory calculations were used to examine the properties of the dimetal core of the recently synthesised dizincocene Zn₂(η⁵-C₅Me₅)₂. Neutral Zn₂ and the zincous dication Zn₂²⁺ were the primary targets and copper dimer Cu₂, iron dimer Fe₂ and the simpler model dizincocene Zn₂(η⁵-C₅H₅)₂ were examined for comparisons. The zincous ion has features arising from mixing of s-, p-, and d-functions that appear in the isoelectronic copper Cu₂ (S=0) dimer, iron Fe₂ (S=0) dimer and the dizincocene molecule. Isometric surfaces of the total charge, Kohn-Sham level partial charge density and the electron localization function (ELF) are reported. The metal-metal valence basin of the ELF density comprised toroidal and axial components, a motif common to the copper and iron dimers and dizincocene. These results are important for understanding the structure of the known and hypothetical dimetallocenes of the first transition series