jan 1, 1888 - 1888- Democritus
According to Democritus atoms were miniscule quantities of matter. Democritus hypothesized that atoms cannot be destroyed, differ in size, shape and temperature, are always moving, and are invisible. He believed that there are an infinite number of atoms. This hypothesis was created in 465 BC.
Added to timeline:
History of the Atom
by Katya Sander, Aurielle Smith, Amaya Mix