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  4. Which of the following has highest second ionization energy?

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Q. Which of the following has highest second ionization energy?

AIIMSAIIMS 2001Classification of Elements and Periodicity in Properties

Solution:

Electronic configuration for chromium is :
$_{24}Cr \to 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{5} 4s^{1}$
After ionisation of $4s$ electron the next electron which will be ionised is from $3d$ orbital. As $3d^5$ electronic configuration, is stable, hence, the second ionisation of $Cr$ will require much greater ionisation energy than the expected one.