The number of unpaired d-electrons in is:

Question

The number of unpaired d-electrons in  is:

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Strategy:
 The number of unpaired electrons depends on the metal's d-electron count and the strength of the ligand field (spectrochemical series).

Step 1: Determine the electronic configuration of 
Cobalt () is .
 is .

Step 2: Analyze ligand field
 is typically a moderate field ligand, but with ,  is high enough that it behaves as a strong field ligand inducing pairing (low-spin complex).

Step 3: Calculate unpaired electrons
Low-spin : . All electrons are paired.
Number of unpaired electrons

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