The chemical formula for compounds containing one silicon atom every two oxygen atoms is SiO₂.

Here's why:

* Silicon (Si): Silicon is a metalloid element with the symbol Si.

* Oxygen (O): Oxygen is a nonmetal element with the symbol O.

* Ratio: The formula reflects the ratio of atoms: one silicon atom (Si) for every two oxygen atoms (O₂).

This formula represents silicon dioxide, a common compound found in nature as quartz and sand.