The Crystal Field Stabilization Energy (CFSE) and magnetic moment (spin-only) of an octahedral aqua complex of a metal ion are and 3.87 BM, respectively. Identify :

Question

The Crystal Field Stabilization Energy (CFSE) and magnetic moment (spin-only) of an octahedral aqua complex of a metal ion  are  and 3.87 BM, respectively. Identify :

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Strategy:
 Use the magnetic moment to find the number of unpaired electrons (), then use  to calculate the CFSE and match it to the given value (-0.8 ) to identify the element.

Step 1: Find unpaired electrons
.
.
The metal ion has 3 unpaired electrons.

Step 2: Calculate CFSE based on possible electron configurations
Given CFSE = .
For , possible high-spin octahedral configurations are  and .
- If : . (Mismatch)
- If : . (Match!)

Step 3: Identify the metal
We need a metal ion with a  configura

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