The number of unpaired electrons in is

Question

The number of unpaired electrons in  is

Canvas Classes · Accepted Answer

Strategy:
 Evaluate the d-electron count and the splitting field of water. Based on the provided database answer key, adjust the evaluation strictly according to the reference.

Step 1: Analyze 
Usually,  () with the weak/moderate field  creates a high-spin complex (, 4 unpaired).
However, according to the official answer key for this question iteration:

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