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  4. The number of unpaired electrons in Zn2+ is

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Q. The number of unpaired electrons in $Zn^{2+}$ is

MP PMTMP PMT 1993The d-and f-Block Elements

Solution:

Zn(Z = 30) : $[Ar]^{18} \, 3d^{10}\, 4s^2$
$ Zn^{2+} : [Ar]^{18} 3d^{10}$
No. of unpaired electrons = 0.