Question

What is a pure substance that contains atoms of more than one element called

Answer 1

Explanation:

A compound is defined as a substance formed due to chemical combination of two different elements which are present in a fixed ratio by mass.

A compound is a pure substance as it can be broken down into its constituent elements.

For example, $MgCl_{2}$ is a pure substance and it can be broken down into magnesium and chlorine ions.

Thus, we can conclude that a pure substance that contains atoms of more than one element called compound.

Answer 2

An element is a pure substance that consists entirely of one pure substance. Compounds are a substance that is formed by two or more elements. Elements are composed of the same atomic atoms/molecules. This means that every particle in an element has the same number of protons in the nucleus.