Q. Which of the following pair of transition metal ions, have the same calculated values of magnetic moment?
A) ${Ti}^{2 +}\ and\ V^{2 +}$
B) ${Fe}^{2 +}and\ {Cu}^{2 +}$
C) ${Cr}^{2 +}and\ {Fe}^{2 +}$
D) ${Co}^{2 +}and\ {Ti}^{2 +}$
Explanation
(c)
${Cr}^{2 +}$ (Z=24): [Ar]$3d^{4}\ 4s^{0}$; four unpaired electrons ${Fe}^{2 +}$ (Z=26) : [Ar]$3d^{6}\ 4s^{0}$; four unpaired electrons. ${Cr}^{2 +}$ and ${Fe}^{2 +}$ have same number of unpaired electrons, hence they have the same value of magnetic moment.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.