Q. The d- electronic configuration of an octahedral Co(II) complex having magnetic moment of 3.95 BM is:
A) $t_{2g}^3e_g^0$
B) $t_{2g}^6e_g^1$
C) $t_{2g}^5e_g^2$
D) $e^4t_2^3$
Explanation
[Solution by Dr. Abubacker] $\mu=\sqrt{n(n+2)}=3.95\Rightarrow n=3$ unpaired electrons. Octahedral Co(II) is $d^7$; three unpaired electrons means high spin: $t_{2g}^5e_g^2$. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.