Final answer:
The reaction of sodium metal with chlorine gas produces sodium chloride, which is a compound.
Step-by-step explanation:
When sodium metal reacts with chlorine gas, they combine in a synthesis reaction to form the compound sodium chloride (table salt). This process involves the transfer of electrons from sodium to chlorine, resulting in the formation of sodium cations (Na+) and chloride anions (Cl−). The resulting sodium chloride is a white, crystalline substance with properties completely different from those of the reactive elements it's composed of. Therefore, the final product of this reaction is best classified as a compound.