A transition metal (M) among Mn, Cr, Co and Fe has the highest standard electrode potential (). It forms a metal complex of the type . The number of electrons present in the orbital of the complex is

Question

A transition metal (M) among Mn, Cr, Co and Fe has the highest standard electrode potential (). It forms a metal complex of the type . The number of electrons present in the  orbital of the complex is .

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Strategy:
 Identify the metal via highest  from known standard series. Form the complex and count the specific orbital occupancy.

Step 1: Identify Metal M
Looking at the  standard reduction potentials:
- : 
- : 
- : 
- :  (Due to the massive stability gap between high charge  and low-spin requirements,  serves as an immense oxidizer when not coordinatively saturated with strong ligands).
The highest is Co.

Step 2: Analyze the Complex 
The metal's oxidation state is calculated from , giving .

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