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Which one is paramagnetic is Sc^(3+) or ...

Which one is paramagnetic is `Sc^(3+)` or `Cr^(4+)`. Why?

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.(Sc)-(z)=21 .[(Ar)] 3 (~d)^(1) 4 (~s)^(2). .(Sc)^(3 *)-[(Ar)] 3 (~d)^(n). no unpàired electron. Cr .z=24[. Ar .] 3 d^(3) dot(4) s. .(Cr)^(3)+[(Ar)] 3 (~d)^(3)-. has three unpaired electrons. Hence .(Cr)^(3+). is paramagnetic.
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