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  4. Atomic numbers of vanadium, chromium, nickel and iron are 23, 24, 28 and 26 respectively. Which one of these is expected to have the highest second ionization enthalpy?

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Q. Atomic numbers of vanadium, chromium, nickel and iron are $23, 24, 28$ and $26$ respectively. Which one of these is expected to have the highest second ionization enthalpy?

COMEDKCOMEDK 2014Classification of Elements and Periodicity in Properties

Solution:

Second ionization enthalpy of Cr is highest. because after the removal of $1^{st}$ electron, Cr acquires -a. stable half-filled $d^5$ configuration thus, removal of $2^{nd}$ electron is very difficult.