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Electronic configuration of chromium is
. The number of unpaired electron in
is 3
![Cr^{3+}(Z=24) =\left [ Ar \right ] 3d^{3}](https://learn.careers360.com/latex-image/?Cr%5E%7B3+%7D%28Z%3D24%29%20%3D%5Cleft%20%5B%20Ar%20%5Cright%20%5D%203d%5E%7B3%7D)
after losing 3 electron, Cr has 3 electron left d-orbital