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  4. Which among the following element has the highest third ionisation enthalpy?

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Q. Which among the following element has the highest third ionisation enthalpy?

NTA AbhyasNTA Abhyas 2022

Solution:

V2+ (21) [ Ar ]18 3d3 4s0
Cr2+ (22) [ Ar ]18 3d4 4s0
Mn2+ (23) [ Ar ]18 3d5 4s0
Fe2+ (24) [ Ar ]18 3d5 4s1
To find ionization enthalpy we first see electronic configuration.
Then we see shell.
If shell are same then see charge.
Then see extra stability ( Half filled and fully filled ).
$\Rightarrow I _{3}( Mn )> I \cdot E _{3}( Fe )> I _{3}( Cr )> I _{3} E _{3}( V )$