Consider that d⁶ metal ion (M²⁺) forms a complex with aqua ligands, and the spin only magnetic moment of the complex is 4.90 BM. The geometry and the crystal field stabilization energy of the complex

Question

Consider that d⁶ metal ion (M²⁺) forms a complex with aqua ligands, and the spin only magnetic moment of the complex is 4.90 BM. The geometry and the crystal field stabilization energy of the complex is:

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Strategy:
 Use the magnetic moment to find the number of unpaired electrons. Then map this to a  configuration in distinct geometries (octahedral or tetrahedral) to find the matching CFSE.

Step 1: Calculate unpaired electrons
Given .
We use . From , we find  unpaired electrons.

Step 2: Check matching geometries for 
- High-spin Octahedral (): . Has 4 unpaired electrons.
  .
- High-spin Tetrahedral (): . Has 4 unpaired electrons.
  .

The valid answer key strictly selects the tetrahedral case t

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