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complexes with more than one type of ligand, Werner succeeded in explaining the number of isomers observed. For example, he explained the existence of two tetramine isomers, "Co(NH₃)₄Cl₃", one green and one purple. Werner proposed that these are two geometric isomers of formula [Co(NH₃)₄Cl₂]Cl, with one Cl^- ion dissociated as confirmed by conductivity measurements. The Co atom is

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