Here's why:

* Elements are the simplest forms of matter that cannot be broken down further by chemical means. Iron is found on the periodic table, signifying its status as an element.

* Mixtures are combinations of two or more substances that are not chemically bonded. Each substance in a mixture retains its individual properties.

However, you might be thinking of iron alloys, which *are* mixtures. These are combinations of iron with other elements, like carbon (in steel), to create materials with desired properties.