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Answer: An indivisible particle is called an atom.
In 450 B.C., the Greek philosopher Democritus first proposed the concept of the atom. He thought about a piece of stuff and began breaking it up into smaller and smaller parts until eventually the material could no longer be broken up into even more tiny particles.
He gave names to these discrete units, later referred to as atoms, hence the name atoms.
John Dalton revives Democritus’ theory, begins to work on it, and conducts numerous experiments to demonstrate the existence of atoms.
As a result, John Dalton is regarded as the originator of atomic theory.
