Chemistry - GENERAL CHEMISTRY Question with Solution | TestHub

Key Idea For an electron, $n$ may be $0,1,2\dots$ and $\mathrm{l}=0$ to $\mathrm{n}-1$ and $\mathrm{m}=-\mathrm{l}$ to $+\mathrm{l}$ (including 0) and $\mathrm{s}=\pm \frac{1}{2}$ Hence, if $$\begin{array}{rl}\mathrm{n}& =3\\ \mathrm{l}& =0\text{ to }(3-1)\\ & =0,1,2\\ \mathrm{m}& =-\mathrm{l}\text{ to }+1\\ & =-2-1,0,+1,+2\\ \mathrm{s}& =\pm \frac{1}{2}\end{array}$$ Therefore, option (c) is not a permissible set of quantum numbers.