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Four successive members of the first row...

Four successive members of the first row transition elements are listed below with their atomic number. Which one of them is expected to have the highest third ionisation enthalpy ?

A

Vanadium (Z = 23)

B

Chromium (Z = 24)

C

Iron (Z = 26)

D

Manganese (Z = 25)

Text Solution

Verified by Experts

The correct Answer is:
D
`""_25Mn = 3d^5 4s^2`
After losing two electron electronic configuration will be like this `(""25Mn^(++) = 3d)^5` and this is most stable configuration due to half filled orbitals hence third ionization enthalpy will be highest in this case.
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