what is atom?
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Explanation:
An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.
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Explanation:
the smallest particle of a chemical element that can exist.
Atoms are the basic units of matter and the defining structure of elements. The term atom comes from the Greek word for indivisible because it was once thought that atoms were the smallest things in the universe and could not be divided
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