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Question

The correct set of quantum numbers (n l m) for the unpaired e− of chlorine is:

A
2 1 0
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B
2 1 1
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C
3 1 1
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D
3 0 0
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Solution

The correct option is C 3 1 1
The electronic configuration for Cl17=[Ne] 3s2 3p5.
Since the unpaired e is in the 3p orbital, we have n=3, l=1, m=1, 0,1
The possible combinations are as follows:
(3 1 1)
(3 1 0)
(3 1 1)

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