The d-electronic configuration of in tetrahedral crystal field is . The sum of m and number of unpaired electrons is

Question

The d-electronic configuration of  in tetrahedral crystal field is . The sum of m and number of unpaired electrons is

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Strategy:
 Draw the precise tetrahedral crystal field splitting diagram for  to find the exact electron distribution and count the unpaired electrons.

Step 1: Establish the configuration
 employs  which has a  configuration.
Since it's tetrahedral, the lower energy level is  (2 orbitals) and the higher energy level is  (3 orbitals). Tetrahedral splitting is small, making it a high-spin complex.

Step 2: Distribute the 7 electrons
- First 2 go into .
- Next 3 go into .
- The remaining 2 pair up

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