Q. The electronic configuration of C$r^{3 +}$ is
A) $\lbrack Ar\rbrack 3d^{4}4s^{2}$
B) $\lbrack Ar\rbrack 3d^{3}4s^{0}$
C) $\lbrack Ar\rbrack 3d^{2}4s^{1}$
D) $\lbrack Ar\rbrack 3d^{5}4s^{1}$
Explanation
(b)
$Cr\ (24):\lbrack Ar\rbrack 3d^{5}4s^{1}$
$Cr^{3 +}:\lbrack Ar\rbrack 3d^{3}4s^{0}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.