Question

Which of the following is not a valid set of four quantum numbers? (n, l, ml, ms )
Question 13 options:

4, 0, 0, +1/2

2, 1, 0, -1/2

3, 2, -1, -1/2

1, 0, 0, +1/2

1, 1, 0, +1/2

Answer 1

1, 1, 0, +1/2 is not valid. For n = 1, l must be in 0 ≤ l ≤ n − 1 = 0, so l = 1 is not allowed.