In the coordination compound [Ni en 2Cl2], there is 1 nickel Ni atom, 2 ethylenediamine en ligands, and 2 chloride Cl ligands. The ratio of nickel to ligands can be calculated as follows:1 Ni : 2 en + 2 Cl So, the ratio of nickel to ligands in the coordination compound [Ni en 2Cl2] is 1:4.