A substance that cannot be broken down into a simpler form by ordinary chemical means is called a(n)?

The correct answer is - an element.

Explanation:

Elements Element or chemical element can not be broken into a simpler form by ordinary chemicals or physical reaction. Each element has its own and specific chemical properties as well as physical properties.

Two same or distinct elements join together by chemical bonds to form a substance known as a compound. However, a mixture of elements does not use chemical bonds to join.

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