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Why Zn^(2+) is diamagnetic whereas Mn^(2...

Why `Zn^(2+)` is diamagnetic whereas `Mn^(2+)` is paramagnetic ?

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Electronic configuration of `Zn4^(++)` is [Ar] `3d^(10)` .As. there are no unpaired electro ns, `Zn^(++)` is diamagnetic. Electronic-configuration of `Cr^(3+)` is [Ar] `3d^(3)` . As it has unpaired electrons `Cr^(3+)` is paramagnetic
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