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  4. Which one of the following transition metal ions is diamagnetic?

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Q. Which one of the following transition metal ions is diamagnetic?

Rajasthan PETRajasthan PET 2010

Solution:

Transition metal ion having absence of unpaired electron is diamagnetic.
[a] $ C{{o}^{2+}}=[Ar]3{{d}^{7}} $ (three unpaired electrons)
[b] $ N{{i}^{2+}}=[Ar]3{{d}^{8}} $ (two unpaired electrons)
[c] $ C{{u}^{2+}}=[Ar]3{{d}^{9}} $ (one unpaired electron)
[d] $ Z{{n}^{2+}}=[Ar]3{{d}^{10}} $ (no unpaired electron)
Thus, $ Z{{n}^{2+}} $ is diamagnetic.