what is atom???????????????
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An atom is the smallest constituent unit of ordinary matter that constitutes a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers.
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Atom is the smallest particle of an element which can take part in the chemical reaction and cannot be sub - divided into simplest form.
(6.022×10^23)
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