The atomic number of V,Cr, Mn and Fe are...

The atomic number of `V,Cr, Mn and Fe` are respectively `23,24,25 and 26.` Which one of these may be expected to have the highest second ionization enthalpy?

A

`Cr`

B

`Mn`

C

`Fe`

D

`V`

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The correct Answer is:

1

`Cr^(+)` has stable half filled electronic configuration ,`[Ar]^(18)3d^(5)4s^(0)`. The removel of one more electron from this stable half filled confihuration will require higher energy.

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