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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 ionisation enthalpy?

A

V

B

Cr

C

Mn

D

Fe

Text Solution

Verified by Experts

The correct Answer is:
b
`V^(o+)=3d^34s^1,Cr^(o+)=3d^5,Mn^(o+)=3d^54s^1,Fe^(o+)=3d^64s^1`
Clearly, `IE_2` of Cr will be highest as `Cr^(o+)` has exactly half filled d-subshell.
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