Q. In a multi-electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields? (A) $n = 1,\ l = 0,\ m = 0$ (B) $n = 2,l = 0,m = 0$ (C) $n = 2,\ l = 1,m = 1$ (D) $n = 3,\ l = 2,\ m = 1$ (E)$n = 3,\ l = 2,\ m = 0$
A) (D) and (E)
B) (C) and (D)
C) (B) and (C)
D) (A) and (B)
Explanation
(a)
$1s$
$2s$
$2p$
$3d$
$3d$
In the absence of any field, 3$d$ in (D) and (E) will be of equal energy.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.