Question

Among the following set of quantum numbers, which one is not valid?

a) n = 5, l = 2, m = 0, s = 1/2

b) n = 5, l = 3, m = 2, s = 1/2

c) n = 1, l = 2, m = 0, s = 1/2

d) n = 5, l = 2, m = 0, s = -1/2

Answer 1

Correct Option: (c)

Reason:Sine, the value of an azimuthal quantum number should lie only between 0 and n-1, where n is the principal quantum number. Therefore, the set of quantum numbers n = 1, l = 2, m = 0, s = 1/2, is not valid.