2
10
4
6
We know that electrons have spin quantum number ms = ±1/2. According to Pauli's exclusion principle, no two electrons can have all four quantum numbers the same. Thus one electron has quantum numbers as: n=3; l=1; m = -1; ms = +1/2 And other electron has quantum numbers as: n=3; l=1; m = -1; ms = -1/2 Thus, 2 electrons can be associated with a given set of quantum numbers. Hence, the correct option is 2