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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 . . . .

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answer is 3.

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Detailed Solution

H- is a multielectron species. Hence, it will follow n+l rule. H−2e→ 1s22s02p0ground state → 1s22s2p1second excited state 1 → Degeneracy = 3

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