Chemistry - GENERAL CHEMISTRY Question with Solution | TestHub

Electronic configuration of $\mathrm{Rb}=\left[\mathrm{Kr}\right]5{\mathrm{s}}^1$

$\mathrm{Rb}$ is alkali metal with valence electron in $5\mathrm{s}$ subshell. Hence, $\mathrm{n}=5$

$\mathrm{Rb}=\left[\mathrm{Kr}\right]5 {\mathrm{s}}^1$

$\mathrm{n}=5$

$\mathrm{l}=0$

$\mathrm{m}=0$

$\mathrm{s}=+\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ or $-\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$

Hence, the answer is option A,