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COMEDK2014ChemistryClassification of Elements and Periodicity in Properties

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?

Options

  1. ACr
  2. BV
  3. CFe
  4. DNi

Correct answer

A. Cr

Step-by-step solution

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

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