Question
Out of Cu2+, Fe2+ and Cr3+, which ion is most paramagnetic and why?
✓
Answer
Electronic configuration of:
Cu2+ = [Ar]3d9
Fe2+ = [Ar]3d6
Cr3+ = [Ar]3d3
Paramagnetism depends on the number of unpaired electrons. From the electronic configuration of these ions, it is clear that Cu2+ has one, Fe2+ has four and Cr3+ has three unpaired electrons. Therefore, Fe2+ is most paramagnetic in nature.
Cu2+ = [Ar]3d9
Fe2+ = [Ar]3d6
Cr3+ = [Ar]3d3
Paramagnetism depends on the number of unpaired electrons. From the electronic configuration of these ions, it is clear that Cu2+ has one, Fe2+ has four and Cr3+ has three unpaired electrons. Therefore, Fe2+ is most paramagnetic in nature.
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