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Ionization Enthalpy

The degenerac...

Question

The degeneracy of the second excited state of $H e^{+}$ 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 $H e^{+}$ ion would be the one in which either $3 s$ , or one of the three $3 p$ orbitals or one of the five $3 d$ orbitals are occupied. Thus, it is 9 fold degenerate.

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