Question

Which of the following is a possible set of quantum numbers for an electron ?

(1, 0, 0, +1)

(2, 2, 1, +)

(4, -3, 0, -)

(3, 2, 1, -)

Answer 1

#2 is +1/2 and 3/4 is -1/2

Answer 2

You can use process of elimination here:

(1, 0, 0, +1) -> Can't be right because the spin can only +/- 1/2
(2, 2, 1, +1/2) -> Can't be right because the angular momentum cannot exceed the principal quantum number - 1
(4, -3, 0, -1/2) -> Can't be right because the angular momentum can't be negative

That leaves you with the last one which is correct: (3, 2, 1, -1/2)

Answer 3

For more info see:
http://www.angelo.edu/faculty/kboudrea/general/quantum_numbers/Quantum_Numbers.htm