d and f Block Elements Part 1

Atomic number 25 is for manganese (Mn).
Configuration of Mn=[Ar]4s23d5
In aqueous medium, Mn2+=[Ar]3d5
Total number of unpaired electrons =5
µ (magnetic moment )=√n(n+2) BM
where, n= number of unpaired electron
∴µ=√5(5+2)=√35BM=5.92BM