The third ionization enthalpy is minimum for:

Question:

The third ionization enthalpy is minimum for:

  1. Co

  2. Fe

  3. Ni

  4. Mn


Correct Option: , 2

Solution:

${ }_{26} \mathrm{Fe}=[\mathrm{Ar}] 3 d^{6} 4 s^{2} .$ Third ionisation results into stable $d^{5}$ configuration.

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