Atomic Structure

The correct set of four quantum numbers for the valence electron of strontium ( $Z=38$ ) is derived from its electronic configuration.Electronic Configuration of Strontium $(Z=38)$ :$1s^2\,2s^2\,2p^6\,3s^2\,3p^6\,4s^2\,3d^{10}\,4p^6\,5s^2$For the Valence Shell Electron $(5s^2)$ :Principal Quantum Number ( $n$ ): 5Azimuthal Quantum Number ( $l$ ): 0 (since it is an $s$-orbital)Magnetic Quantum Number $(m): 0$ (since $m$ ranges from $-l$ to $+l$, and for $l=0, m=0$ )Spin Quantum Number: $\;\frac{1}{2}$Thus, the correct set of quantum numbers for the valence electron is $\left(5,0,0,\;\frac{1}{2}\right)$.