The complex [ PtCl ₂( en )₂ ]²⁺ ion shows

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The complex [ PtCl ₂( en )₂ ]²⁺ has a coordination number of 6, indicating an octahedral geometry. The ligands are two chloride ions and two ethylenediamine (en) molecules, which are bidentate. The complex can exist in two geometrical forms: the cis-isomer and the trans-isomer. In the trans-isomer, the two chloride ligands are at 180 degrees to each other, resulting in a plane of symmetry, which makes it achiral (optically inactive). In the cis-isomer, the two chloride ligands are at 90 degrees to each other. The c