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Manipal MET2019Chemistryd and f Block Elements

Which of the following has highest second ionisation energy

Options

  1. AChromium
  2. BCalcium
  3. CIron
  4. DCobalt

Correct answer

A. Chromium

Step-by-step solution

The electronic configuration of ₂₄ C_r is [ Ar ]₁₈ 3 d₁^5 4 s^1 . Chromium after loss of one electron gain stable configuration due to presence of half filled d-orbitals, therefore its second ionisation enthalphy is highest.

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