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  4. Which of the following has the same number of unpaired electrons as are present in samarium?

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Q. Which of the following has the same number of unpaired electrons as are present in samarium?

J & K CETJ & K CET 2001

Solution:

The electronic configuration of samarium is as:
$Sm(Z=62):[X e] 6 s^{2} 4 f^{6}$
Number of unpaired electron $= 6$
The electronic configuration of chromium is as:
$C r(Z=24):[A r] 3 d^{5} 4 s^{1}$
Number of unpaired electrons $=6$
Hence, $Sm$ and $Cr$ both have same number of unpaired electrons.