Answer:
A material that contains three elements joined in a fixed proportion will be a compound.
Explanation:
An element can be described as a substance that is made of only one kind of atom.
On the other hand, a compound can be described as a substance that is made up of more than one atom or elements. A compound can contain fixed proportions of each element that it is made of or it can even contain different proportions of each element.
For example, carbon dioxide is a compound which will always contain 12 grams of carbon for every 32 grams of oxygen.
