The number of electrons present in all the completely filled subshells having $n=4$ and $s=+\frac{1}

Question

The number of electrons present in all the completely filled subshells having $n=4$ and $s=+\frac{1}{2}$ is $\qquad$\ (Where $n=$ principal quantum number and $s=$ spin quantum number)\

Professor PC Thomas Classes · Answer

(16): In $n=4$ has one ' $s$ ', three ' $p$ ', five ' $d$ ' and seven ' $f$ ' orbitals. In these 16 orbitals, 16 electrons have spin $(s)=+\frac{1}{2}$ while other 16 electrons have $\operatorname{spin}(s)=-\frac{1}{2}$.\