Question:
The Azimuthal quantum number for the valence electrons of $\mathrm{Ga}^{+}$ion is_________.
(Atomic number of Ga $=31$ )
Solution:
$\mathrm{Ga}^{+}: \mathrm{Is}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{~s}^{2} 3 \mathrm{p}^{6} 3 \mathrm{~d}^{10} 4 \mathrm{~s}^{2}$
The azimuthal quantum number for the valence electrons (4s-subshell) of Ga+ ion is zero $(0)$.