# What kind of reaction is 2Al (s)+3Cl_2 (g) -> 2AlCl_3(s)?

Zerovalent aluminum is OXIDIZED to $A l \left(I I I\right)$; it has formally lost 3 electrons. Zerovalent chlorine gas is REDUCED to $C {l}^{-}$. Diatomic chlorine gas accepted 2 electrons to form 2 equiv of chloride ion, $C {l}^{-}$.