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What is the primary valence of iron in the coordination entity of compound Fe4[Fe(CN)6]3?

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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 primary valence of iron in the coordination entity of compound Fe<sub>4</sub>[Fe(CN)<sub>6</sub>]<sub>3</sub>?





 
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