Question

which answer choice is an element?

Explanation:

An element is a pure substance made up of only one type of atom. In the given images, X shows only one - type of atom (represented by green spheres), indicating it is an element. Y has two different types of atoms (green and purple), Z has multiple types of atoms combined in molecules (blue, white, and red), and W has a combination of different atoms and molecules.

Answer:

C. X