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Question

Chemistry Question on d -and f -Block Elements

Which one of the following has maximum magnetic moment?

A

Mn2+{ Mn^{2+}}

B

Fe2+{ Fe^{2+}}

C

Co2+{ Co^{2+}}

D

Ti2+{Ti^{2+}}

Answer

Mn2+{ Mn^{2+}}

Explanation

Solution

Electronic configuration of Mn2+=[Ar]3d5&Mn ^{2+}=[ Ar ] 3 d ^{5} \& No. of unpaired electrons =5=5

Electronic configuration of Fe2+=[Ar]3d6&NoFe ^{2+}=[ Ar ] 3 d ^{6} \& No. of unpaired electrons =4=4

Electronic configuration of Ti2+=[Ar]3d2&Ti ^{2+}=[ Ar ] 3 d ^{2} \& No. of unpaired electrons =2=2

Electronic configuration of Cr2+=[Ar]3d4&NoCr ^{2+}=[ Ar ] 3 d ^{4} \& No. of unpaired electrons =4=4

Magnetic moment =n(n+2)=\sqrt{ n ( n +2)} B.M., where nn is the number of unpaired electrons

Therefore, the maximum number of unpaired electrons are in Mn2+Mn ^{2+}.