Question

how is this substance classified? it has the formula xz.
a homogeneous mixture
a heterogeneous mixture
an element
a compound

Explanation:

A compound is a pure substance made of two or more different elements chemically combined in a fixed ratio. The substance has the formula XZ, meaning it consists of two distinct elements (X and Z) bonded together, and the particle diagram shows a uniform arrangement of these combined elements. Mixtures are physical combinations of substances, and elements are made of only one type of atom, so this does not fit those categories.

Answer:

a compound