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Quantum mechanical model of the atom

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By Expert Faculty of Sri Chaitanya
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. 

H2e  1s22s02p0ground state               1s22s2p1second excited state  1     Degeneracy = 3


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