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  4. Not considering the electron spin, the degeneracy of second excited state is 9, while the degeneracy of second excited state of H - is-

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Q. Not considering the electron spin, the degeneracy of second excited state is $9,$ while the degeneracy of second excited state of $H ^{-}$ is-

Structure of Atom

Solution:

$H ^{-}(2):-1 s ^{2}$

It's a multielectron specie, first excited state will be $2s$ & $2^{\text {nd }}$ excited state will be 2 p. Degeneracy of $2s$ is $1$ Degeneracy of $2p$ will be $3$