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Question: Answered & Verified by Expert
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 ionisation enthalpy?
ChemistryClassification of Elements and Periodicity in PropertiesCOMEDKCOMEDK 2014
Options:
  • A $\mathrm{Cr}$
  • B $\mathrm{V}$
  • C $\mathrm{Fe}$
  • D $\mathrm{Ni}$
Solution:
2169 Upvotes Verified Answer
The correct answer is: $\mathrm{Cr}$
Second ionisation enthalpy of $\mathrm{Cr}$ is highest because after the removal of 1st electron, Cr acquires a stable half-filled $d^{5}$ configuration thus, removal of 2 nd electron is very difficult.

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