The number of unpaired electrons in Gadolinium $[Z=64]$ is

The number of unpaired electrons in Gadolinium $[Z=64]$ is
  1. 3
  2. 8
  3. 6
  4. 2

Solution

$\mathrm{Gd}(64)=[\mathrm{Xe}] 4 f^{7} 5 d^{1} 6 s^{2}$
$\therefore$ No. of unpaired electrons $=8$

Asked in: JEE-TOPICTESTS-CHEMISTRY

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