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Substances that cannot be broken down into simpler substances are called ____________.

Answer: It is called an Element.

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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.

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