Atomic Structure - Result Question 91

####67. 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 (2015 Adv.)

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Answer:

Correct Answer: 67. (6)

Solution:

  1. In an one electron (hydrogenic) system, all orbitals of a shell remains degenerate, hence in second excited state, the degeneracy of $H$-atom is nine

In case of many electrons system, different orbitals of a shell are non-degenerate. Hence,



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