Question

Not considering the electronic spin, the degeneracy of the second excited state( n = 3) of H atom is 9, while the degeneracy of the second excited state of H^- is

Answer 1

Correct answer is 3

Single electron species don’t follow the (n+l) rule but multi electron species do

Ground state of H^- = 1s² 

First excited state of H^- = 1s¹ , 2s¹ 

Second excited state of H^- = 1s¹ , 2s⁰ , 2p^1'

(3 degenerate orbitals)