Define an atom.

The smallest unit of element is called atom

Dear student {Abhi}
Here is your answer :-
An atom a fundamental piece of matter. ... An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons. The protons and the neutrons make up the center of the atom called the nucleus and the electrons fly around above the nucleus in a small cloud.

Or we can say

the smallest part into which an element can be divided
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Image of atom :


Hope it helps you and your doubts are cleared. Regards!

Hope it helps

An atom a fundamental piece of matter. ... An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons. The protons and the neutrons make up the center of the atom called the nucleus and the electrons fly around above the nucleus in a small cloud.