The degeneracy of the second excited state of He+ ion is:
A
1
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B
3
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C
5
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D
9
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Solution
The correct option is D 9 The second excited state of He+ ion would be the one in which either 3s, or one of the three 3p orbitals or one of the five 3d orbitals are occupied. Thus, it is 9 fold degenerate.