Question
Chemistry Question on d -and f -Block Elements
Which one of the following shows highest magnetic moment ?
A
V3+
B
Cr3+
C
Fe3+
D
Co3+
Answer
Fe3+
Explanation
Solution
V3+:[Ar]183d2;Cr3+:[Ar]183d3 Fe3+:[Ar]183d5;Co3+:[Ar]183d6. More the number of unpaired electrons, more is the magnetic moment. As such Fe3+ (with 5 unpaired electrons −3d5 configuration) will have highest magnetic moment