(D) The atomic number of sodium $(Na)$ is $11$.Its electronic configuration is $1s^2 2s^2 2p^6 3s^1$.The valence electron is in the $3s$ orbital.For a

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

(D) The atomic number of sodium $(Na)$ is $11$.Its electronic configuration is $1s^2 2s^2 2p^6 3s^1$.The valence electron is in the $3s$ orbital.For an $s$ orbital,the azimuthal quantum number $(l)$ is $0$.The magnetic quantum number $(m_l)$ ranges from $-l$ to $+l$.Since $l = 0$,the only possible value for $m_l$ is $0$.