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Which of the following quantum number combinations is not allowed in a ground-state atom?

(2, 1, 1, -½)
(8, 7, -7, +½)
(5, 5, -5, +½)
(1, 0, 0, +½)

Answer :

susanwiederspan
The third option. The angular quantum number ([tex]l[/tex]) can be any integer between 0 and [tex]n-1[/tex]. Therefore, for the third option, [tex]l[/tex] can be 0, 1, 2, 3, or 4—but not 5.

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