## Chemistry: The Central Science (13th Edition)

This set is invalid in $l$.
*RULES TO REMEMBER: - $n\gt0$ and $l\ge0$ - $l\lt n$ - $|m_l|\leq l$, which also means $m_l\leq l$ - There are only 2 possible values for $m_s$: $\frac{1}{2}$ and $-\frac{1}{2}$. Here $l=n=2$, which is invalid because according to the rule, $l\lt n$.