Chapter 6 - Electronic Structure of Atoms - Additional Exercises - Page 254: 6.93e

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, $l\lt n$.