Sodium (Na) and chloride (Cl) are elements. When they combine chemically, they form sodium chloride (NaCl), which is a compound.

Here's the breakdown:

* Elements are the simplest pure substances that cannot be broken down further by chemical means.

* Compounds are formed when two or more elements combine chemically in a fixed ratio.

* Mixtures are combinations of two or more substances that are not chemically bonded.

Sodium chloride (NaCl), commonly known as table salt, is a compound formed by the chemical reaction between sodium and chlorine.