In complexes of transition metals, the maximum coordination number of the metal is equal to its number of d electrons.

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The maximum coordination number of a metal in a complex is not determined by its number of d electrons but rather by the size, charge, and electron configuration of the metal ion, as well as the size and electronic properties of the ligands. Coordination numbers commonly range from 2 to 12, with 6 being particularly common for many transition metals, regardless of their d electron count.

In Complexes of Transition Metals, the Maximum Coordination Number of the Metal