Chapter 31 - Atomic Physics - Problems and Conceptual Exercises - Page 1113: 52

$n=3$ $l=0$ $m_l=0$ $m_s=\frac{-1}{2}\space and \frac{+1}{2}$

We know that for the 3s subshell $n=3$ and for the s subshell l=0 We also know that for $n=3$ and $l=0$ $m_l=0$ and $m_s=\frac{-1}{2}\space and \frac{+1}{2}$ Hence, the required set of four quantum numbers is: $n=3$ $l=0$ $m_l=0$ $m_s=\frac{-1}{2}\space and \frac{+1}{2}$