Here's why:

* Physical properties are characteristics of a substance that can be observed or measured without changing the substance's chemical composition. Examples include color, density, melting point, and boiling point.

* Chemical properties describe how a substance reacts with other substances or how it changes its chemical composition.

Sodium chloride is the chemical name for table salt. It's formed by the chemical reaction of sodium (Na) and chlorine (Cl).

Therefore, sodium chloride is not a property but a substance with specific physical and chemical properties.