The Azimuthal quantum number for the valence

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 $(0)$.

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