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The number of unpaired electrons in $\mathrm{Co}^{2+}$, is
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3
Atomic number of $\mathrm{Co}=27$
Electronic configuration of Co is [Ar] $3 d^7 4 s^2$.
Electronic configuration of $\mathrm{Co}^{2+}$ is $[\mathrm{Ar}] 3 d^7 4 s^0$.
So, number of unpaired electrons is 3.
Electronic configuration of Co is [Ar] $3 d^7 4 s^2$.
Electronic configuration of $\mathrm{Co}^{2+}$ is $[\mathrm{Ar}] 3 d^7 4 s^0$.
So, number of unpaired electrons is 3.
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