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He hypothesised that all matter is made up of tiny discrete called atoms which are to small to be seen.
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When the Atomic Theory was discovered, Aristotle did not believe in it. He believed that all substances were made of Fire, Water, Air, and Earth. He taught his beliefs, and he was so well known for his teachings, most believed him to be right.
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The main points of Dalton's atomic theory were: Elements are made of extremely small particles called atoms. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties. Atoms cannot be subdivided, created, or destroyed.
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Although Scottish botanist Robert Brown (1773-1858) was responsible for discovering the nucleus of a cell, he is perhaps best known for his discovery of the random movement of microscopic particles in a surrounding solution, later referred to as "Brownian motion."
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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
