Question

Hai I am very new in this app explain me what is atom! ​

Answer 1

Answer:

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Atom : smallest particle which smaller than a mole

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Answer 2

An atom is the smallest constituent unit of ordinary matter that constitutes a chemical element.  They are so small that accurately predicting their behavior using classical physics – as if they were billiard balls, for example – is not possible. This is due to quantum effects.

Every atom is composed of a nucleus and one or more electrons bound to the nucleus.