\(Cu^{2+}\): \(\left[Ar\right]3d^{10}4s^1\)
\(Fe^{3+}\): \(\left[Ar\right]3d^5\)
\(Cr^{3+}\): \(\left[Ar\right]3d^3\)
\(Mn^{2+}\): \(\left[Ar\right]3d^5\)
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