Question

Not considering the electron spin, the degeneracy of first excited state (n=2) of H-atom is:
(a) 2
(b) 3
(c) 4
(d) 8

please answer with explaination​

Answer 1

Not considering the electron spin, the degeneracy of first excited state (n=2) of H-atom is: 2

Explanation:

Single electron species don't follow the H rule and all orbitals of a particular shell have same energy and are called degenerate orbitals.

Therefore, second excited state of H(n=3) will have 9 orbitals of same energy i.e; degeneracy=9

Hence. option a) is correct.

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