Is my answer correct?

Which of the following is a possible set of quantum numbers for an electron (n, l, m subscript l, m subscript s) ?

(1, 0, 0, + 1)

(2, 2, 1, + 1/2)

(4, - 3, 0, - 1/2)

(3, 2, 1, - 1/2) < - - - my answer

Your answer is correct. Quantum numbers, n and l can only take positive values.

Where:

n = cannot be zero

l = any number from zero to n-1

lm = any number between - l and + l including zero

ms = either - 1/2 or + 1/2

Looking at the choices, (3, 2, 1, - 1/2) is the only choice that satisfy the criteria.