How many unpaired electrons are there in the complex ion [ni(cn)6]3−?
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The iron ion in K [ F e C l 4 ] (low spin, tetrahedral) has a 3+ oxidation state so it is a d5 ion since the iron atom loses two 4s electrons and one 3d electron. Adding 5 electrons to the tetrahedral d-orbital diagram identifies that one electron will be unpaired
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