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Atomic numbers of vanadium, chromium, nickel and iron are 23, 24, 2g and 26 respectively. Which one of these is expected to have the highest second ionization enthalpy?

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a

Cr

b

V

c

Fe

d

Ni

answer is A.

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Detailed Solution

Second ionization enthalpy of Cr is highest because after the removal of 1st electron, Cr acquires a stable half-filled d5 configuration thus, removal of 2nd electron is very difficult.

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Atomic numbers of vanadium, chromium, nickel and iron are 23, 24, 2g and 26 respectively. Which one of these is expected to have the highest second ionization enthalpy?