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384
Aristotle
Aristotle did not believe in the atomic theory and he taught so otherwise. He thought that all materials on Earth were not made of atoms, but of the four elements, Earth, Fire, Water, and Air. He believed all substances were made of small amounts of these four elements of matter. -
460
Democritus
According to Democritus' atomic theory, the universe and all matter obey the following principles: Everything is composed of “atoms”, which are physically, but not geometrically, indivisible. Between atoms, there lies empty space. ... There are an infinite number of atoms, and kinds of atoms, which differ in shape,He also said every thing is made up of atoms. -
John Dalton
Suggested that matter is made up of small discrete particles which are like little solid balls. -
Robert brown
The elements arranged in families, ordered in order of increasing atomic number (the number of protons in the nucleus). Brownian Motion. The jerking movement of microscopic particles only visible under a high powered microscope. -
Albert Einstein
Albert Einstein became famous for the theory of relativity, which laid the basis for the release of atomic energy. In 1905 Albert Einstein formulates Special Theory of Relativity. Einstein calculates how the movement of molecules in a liquid can cause the Brownian motion.
