The ability of an element to react with acids is an example of a chemical property.

Here's why:

* Chemical properties describe how a substance interacts with other substances to form new substances. They involve changes in the composition of the substance.

* Physical properties can be observed without changing the composition of the substance. Examples include color, density, melting point, etc.

When an element reacts with an acid, it undergoes a chemical change, resulting in the formation of new compounds. This change in composition is what defines it as a chemical property.