Question

10. The sub-shell which does not exist, has the
quantum numbers:
(a) n = 2,l = 0
(b) n = 2,l = 1
(c) n = 2,l = 2
(d) n = 3,l = 0
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Answer 1

Answer:

The answer is {a} n=2,l=0

Answer 2

Answer:

The sub-shell which does not exist has the quantum numbers (c) n=2, l=2.

Explanation:

(c) n = 2,l = 2

• Here, the principal quantum number is 2.
• For n=2, the values of azimuthal quantum number are 0 for s and 1 for p.
• l=2 indicates that it is a d sub-shell. We know that the d sub-shell starts from n=3, i.e., 3d.
• Therefore, the sub-shell with n=2 and l=2 does not exist.

Explanation for incorrect options:

(a) n = 2,l = 0

• Here, the principal quantum number is 2.
• For n=2, the values of azimuthal quantum number are 0 for s and 1 for p.
• l=0 indicates that it is an s sub-shell, i.e., 2s.

(b) n = 2,l = 1

• Here, the principal quantum number is 2.
• For n=2, the values of azimuthal quantum number are 0 for s and 1 for p.
• l=1 indicates that it is a p sub-shell, i.e., 2p.

(d) n = 3,l = 0

• Here, the principal quantum number is 2.
• For n=2, the values of azimuthal quantum number are 0 for s and 1 for p.
• l=0 indicates that it is an s sub-shell, i.e., 3s.

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