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  4. The atom of which one of the following elements has the highest number of unpaired electrons?

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Q. The atom of which one of the following elements has the highest number of unpaired electrons?

J & K CETJ & K CET 2009The d-and f-Block Elements

Solution:

The electronic configuration of the given elements is as
${ }_{25} M n=[A r] 3 d^{5}, 4 s^{2}$ (Five unpaired electrons)
${ }_{24} C r=[A r] 3 d^{5}, 4 s^{1}$ (Six unpaired electrons)
${ }_{96} C m=[R n] 5 f^{7}, 6 d^{1}, 7 s^{2}$ (Eight unpaired electrons)
${ }_{26} F e=[A r] 3 d^{6}, 4 s^{2}$ (Four unpaired electrons)
Thus, ${ }_{96} Cm$ has the highest number of unpaired electrons.