# What is a balanced equation for the following reaction: silver + chlorine -> silver chloride?

$2 A g + C {l}_{2} \to 2 A g C l$
Silver forms an $A {g}^{+}$ ion and Chlorine gains an electron to form a $C {l}^{-}$ ion. However, Chlorine exists as diatomic molecules, meaning it goes round in pairs of two chlorine atoms, so the chlorine as a reactant would be $C {l}_{2}$, and thus we need 2 $A g$ atoms to balance it out.