The number of unpaired electrons in the valence shell of silicon is

The atomic number of silicon (Si) is  Z = 14.

The electronic configuration of silicon is $1{\text{s}}^{2}2{\text{s}}^{2}2{\text{p}}^{6}3{\text{s}}^{2}3{\text{p}}^2$.

From orbital box method electronic configuration silicon is

The total number of unpaired electrons present in the valence shell of silicon is 2.