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

Answer 1

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Answer 2

Answer:

Given, initially, in a hydrogen atom, the electron is in ground state ∴n=1. Therefore, the energy of the electron in ground state is −13.6eV. Therefore, the energy required to move electrons from ground state to third excited state is 12.75eV.