Answer: Element
Explanation:
Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: Gold [tex]Au[/tex]
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: carbon dioxide [tex]CO_2[/tex]
[tex]CO_2\rightarrow C+O_2[/tex]
Thus as it given that substances cannot be broken down into simpler substances, thus they are called elements.