* Elements: Elements are pure substances made up of only one type of atom (like sodium (Na) or chlorine (Cl)).

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

* Mixtures: Mixtures are combinations of substances where each substance retains its own properties.

In the case of salt, sodium (Na) and chlorine (Cl) atoms have chemically bonded to form a new substance with properties distinct from either element alone.