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Question

Chemistry Question on d -and f -Block Elements

Which one of the following shows highest magnetic moment ?

A

V3+V^{3+}

B

Cr3+Cr^{3+}

C

Fe3+Fe^{3+}

D

Co3+Co^{3+}

Answer

Fe3+Fe^{3+}

Explanation

Solution

V3+:[Ar]183d2;Cr3+:[Ar]183d3V^{3+} : [Ar]^{18}\, 3d^2 ; Cr^{3+} : [Ar]^{18} \, 3d^3 Fe3+:[Ar]183d5;Co3+:[Ar]183d6 Fe^{3+} : [Ar]^{18} \, 3d^5 ; Co^{3+} : [Ar]^{18} \, 3d^6. More the number of unpaired electrons, more is the magnetic moment. As such Fe3+Fe^{3+} (with 5 unpaired electrons 3d5-3d^5 configuration) will have highest magnetic moment