Question

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

Answer 1

Hello there.

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

Answer: It is called an Element.

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Answer 2

Answer: Element

Step-by-step 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
`Au`

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
`CO_2`

`CO_2\rightarrow C+O_2`

Thus as it given that substances cannot be broken down into simpler substances, thus they are called elements.