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The name of this compound is potassium tetra cyano nickelate (II). This is because it is an ion that forms with potassium and the nickelate coordination compound. The (II) refers to the oxidation state of the nickel in the compound and comes from the charge of the nickel. Because the overall charge of the [Ni(CN)4] is 2- and the charge of CN is 1-, you add all the charges to get a charge of 4-, which must be offset by nickel's charge of 2+ to get the overall charge of 2-. So because nickel's charge is 2+, its oxidation number is (II).
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