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
???? ???? ?? ???? ???????? ???; ??????
Image of atom :
Hope it helps you and your doubts are cleared. Regards!