Stereoisomerism in heteroleptic complexes arises from different geometric arrangements of ligands. Examples occur in coordination numbers 4 and 6, such as square planar complexes [MX₂L₂] and octahedral complexes [MX₂L₄].

Isomers are compounds with the same chemical formula but different atom arrangements. Stereoisomers have the same chemical bonds but differ in spatial arrangement, while structural isomers have different bonds.

It is named diamminesilver(I) dicyanidoargentate(I). The Roman numerals indicate the oxidation state of silver, which is +1. The name also reflects the ligands present in the complex cations.

The name is tris(ethane-1,2–diamine)cobalt(III) sulphate. The oxidation state of cobalt is deduced from the charge on the complex cation, which is +3, as three sulphates are needed to balance two complex cations.

It is named as triamminetriaquachromium(III) chloride. The ligands are arranged alphabetically, and the oxidation number of chromium is calculated from the charge on the complex ion, which is +3 due to the three chloride ions.