Question

A pure substance that contains more than one atom is called a(n)...

Answer 1

Element.

a pure substance cannot be broken down into simpler substances by chemical means. 

Answer 2

Answer:

• A pure substance that contains more than one atom is called a compound.

Explanation:

• Compounds are formed by combination of atoms by a fixed ratio. They have their own characteristic features.
• Pure substances are further broken down into elements and compounds. A compound can be destroyed by chemical means. It might be broken down into simpler compounds, into its elements or a combination of the two.

Example

• H2SO4 which  is formed by combination of three different atoms like H, S and O.