(Chemistry) 1.) For each element in the table below, use the Gizmo to find the number of valence electrons and then list the valence, based on the Lewis diagram.
2.) Then, find the sum of these numbers.

(I need help with the Valence, and Sums columns. As well as the entire Silicon column.)
(Also ignore the gizmo instructions. I can't find these using the Gizmo.)