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What is the sum of the oxidation number of cobalt in [Co(H2O)(CN)(en)2]2+and [CoBr2(en)2]+?

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Werner's theory states that the transition metal cation will have two valencies: a primary and a secondary. The primary valence is equal to the oxidation number of the metal cation, is ionizable, and can be satisfied by negative charges.


What is the sum of the oxidation number of cobalt in [Co(H<sub>2</sub>O)(CN)(en)<sub>2</sub>]<sup>2+</sup>and [CoBr<sub>2</sub>(en)<sub>2</sub>]<sup>+</sup>?






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