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Q.
Which of the following ions is paramagnetic?
The d-and f-Block Elements
Solution:
Elements or ions containing unpaired electrons are paramagnetic.
$_{28}Ni = \left[Ar\right]3d^{8}4s^{2};Ni^{2+}=\left[Ar\right]3d^{8}4s^{0}$
Because $Ni^{2+}$ ions have 2 unpaired electrons in $3d$ subshell therefore it is paramagnetic.
