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1773 BCE
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. It was discovered by the biologist Robert Brown in 1827. -
460 BCE
Democritus
His mentor, Leucippus, originally came up with the atomic theory, but it was then adopted by Democritus. The atomic theory stated that “The universe is composed of two elements: the atoms and the void in which they exist and move.” According to Democritus atoms were miniscule quantities of matter. -
460 BCE
Aristotle
His mentor, Leucippus, originally came up with the atomic theory, but it was then adopted by Democritus. The atomic theory stated that “The universe is composed of two elements: the atoms and the void in which they exist and move.” According to Democritus atoms were miniscule quantities of matter. -
John Dalton
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. It was discovered by the biologist Robert Brown in 1827. -
Albert Einstine
Albert Einstein became famous for the theory of relativity, which laid the basis for the release of atomic energy. In 1905 Albert Einsteinformulates Special Theory of Relativity. Einstein calculates how the movement of molecules in a liquid can cause the Brownian motion