An element.
Any substance that cannot be broken down into simpler substances is an?
An element cannot be broken down into a simpler substance by chemical means.
an element is a substance that cannot be broken down into a simpler form by chemical means
No, it can be broken down.
An element.
If an unknown substance cannot be broken down into simpler substances it is made of one kind of atom and an element.
an element
All of the elements of the periodic table cannot be broken down into simpler substances.
Its Elements
elements
No. Elements cannot be broken down into simpler substances in a chemical reaction.
A substance that cannot be broken down is a pure substance