Question

7. The degeneracy of H-atom in a shell is 9. The value of
principal quantum number (n) for the shell is
(A) 3
(B) 9
(C) 1
(D) None of these​

Answer 1

Answer:

3

Explanation:

• Degeneracy of the energy levels of the hydrogen atom =n²

• where,
• n = principal quantum no.
• Given that degeneracy of H−atom in a shell is 9.
• ∴9=n²

• ⇒n=3
• Hence, the value of principal quantum number (n) for the shell is 3.

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