* Sodium (Na): A soft, silvery-white metal.

* Chlorine (Cl): A greenish-yellow gas.

When sodium and chlorine react chemically, they form sodium chloride, commonly known as table salt. This reaction is a chemical change, meaning that the original substances (sodium and chlorine) are no longer present in their original forms.

Therefore, salt is a compound, which is defined as a substance composed of two or more elements chemically bonded together.