First slide

Quantum mechanical model of the atom

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 . . . .

Moderate

Solution

H^- is a multielectron species. Hence, it will follow $(n + l)$ rule.
$H^{-} (2 e) \to_{}^{} 1 s^{2} 2 s^{0} 2 p^{0} (ground state) \to_{}^{} 1 s^{2} 2 s 2 p^{1} (second excited state) 1 \to_{}^{} Degeneracy = 3$

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