what is atom ,??????
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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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→ All matter is made up of small particles i.e atoms and molecules.
→ An atom in the smallest particle of an element that can take part in a chemical reaction.
→ They are very , very small in size
→ Its size is indicated by " atomic radius"
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