Question:
Which one of the following atomic spectral transitions is forbidden (by the selection rule \(\Delta l = \pm 1\))?
Which one of the following atomic spectral transitions is forbidden (by the selection rule \(\Delta l = \pm 1\))?
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Compute the change in l for each transition; only Delta l = +/-1 is allowed.
Updated On: Jul 3, 2026
- 3d to 4f
- 2p to 3s
- 3p to 3d
- 4p to 5f
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The Correct Option is D
Solution and Explanation
Step 1: Selection rule: delta l = +/-1.
Step 2: 3d(l=2)-4f(l=3): delta l=+1, allowed. 2p(l=1)-3s(l=0): delta l=-1, allowed. 3p(l=1)-3d(l=2): delta l=+1, allowed. 4p(l=1)-5f(l=3): delta l=+2, forbidden.
\[\boxed{\text{4p} \to \text{5f is forbidden}}\]Was this answer helpful?
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