The calculated magnetic moments (spin only value) for species , and respectively are:

Question

The calculated magnetic moments (spin only value) for species ,  and  respectively are:

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Strategy:
 For each complex, determine the oxidation state of the central metal, its d-electron count, the ligand field strength (weak or strong), and the resulting number of unpaired electrons (). Then calculate  BM.

Step 1: Analyze 
- Fe oxidation state: .
-  has a  configuration.
-  is a weak field ligand  high-spin complex.
- Configuration:  (Wait, tetrahedral splitting is  then , so ). Total unpaired electrons () = 4.
- .

Step 2: Analyze 
- Co oxidation state: .
-  has a  configuration.
-

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