The scientific theory that matter is made up of tiny particles known as atoms is known as atomic theory.
Atomism is an ancient philosophical tradition that inspired the atomic theory.
This theory states that if a lump of matter is cut into ever smaller pieces, it will eventually reach a point where the pieces can no longer be cut any smaller.
Atomic theory is a theory that classifies many elementary states, facts, and properties about atoms, including postulates and axioms.
The atomic model, according to Dalton, consists of an atom in hard spheres.
The atomic model, according to Rutherford, includes atoms in the shape of solar systems.