Question
Chemistry Question on d -and f -Block Elements
Which one of the following has maximum magnetic moment?
A
Mn2+
B
Fe2+
C
Co2+
D
Ti2+
Answer
Mn2+
Explanation
Solution
Electronic configuration of Mn2+=[Ar]3d5& No. of unpaired electrons =5
Electronic configuration of Fe2+=[Ar]3d6&No. of unpaired electrons =4
Electronic configuration of Ti2+=[Ar]3d2& No. of unpaired electrons =2
Electronic configuration of Cr2+=[Ar]3d4&No. of unpaired electrons =4
Magnetic moment =n(n+2) B.M., where n is the number of unpaired electrons
Therefore, the maximum number of unpaired electrons are in Mn2+.