The $\mathrm{e}^{-}$is a well defined correlation between $\mathrm{n}, l, \mathrm{~m}$ and s quantum numbers in an atom. $l=(\mathrm{n}-1), \mathrm{m}$ will be $\pm 1 / 2$, for $\mathrm{n}=3$ there cannot be $\mathrm{m}=3$. Highest value $\mathrm{m}$ will be 2 .