Predict the no.of unpaired electrons in the tetrahedral (MnBr4) ion

The complex is [Mn(Br)4]ion

[Mn(Br)4]- complexx + 4 (-1) = -1x = + 3Mn at no = 25Electronic configuration is 3d5 4s2Mn+3 = 3d4No of unpaired electron = 4 
 

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