Democritus was an ancient Greek who created the first atomic model; it was a simple round sphere with no electrons, protons, or neutrons. His atom helped other scientists understand and further look into the science of the basic structure of an atom.
Democritus believed that all matters consist of invisible particles called atoms. The atoms are indestructible, solid but invisible and are homogenous. All atoms differ in size, shape, mass, position, and arrangement. Democritus has proven that solids are made of small, pointy atoms. Liquids are made of large, round atoms and Oils are made of very fine, small atoms that can easily slip past each other.
The description of his model; is unbreakable particles, with a different particle for each different substance.