The chemical equation for the reaction between a silicon atom (Si) and a chlorine molecule (Cl₂) is:

Si + 2Cl₂ → SiCl₄

This reaction produces silicon tetrachloride (SiCl₄).

Here's the breakdown:

* Si: A single silicon atom.

* 2Cl₂: Two molecules of chlorine gas, each containing two chlorine atoms.

* SiCl₄: One molecule of silicon tetrachloride, containing one silicon atom and four chlorine atoms.

This reaction is an example of a combination reaction, where two or more reactants combine to form a single product. The reaction is also exothermic, meaning it releases heat.