A pure substance that cannot be broken down into simpler substances by physical or chemical means is an?

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A pure substance that cannot be broken down into simpler substances by physical or chemical means is an element. This is because Elements can't be broken down chemically into other substances because there is nothing to break them down into.
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What is a substance that cannot be broken down chemically into simpler substances?

The substance would be an element. An element is the simplest and purest form of a chemical substance. It may exist freely as an identity, or in groups of similar elements (e