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Atomic Theory Timeline
7 Jan 2018
442 - Democritus formed the idea that matter is composed of atoms.
1774 - Antoine Laviosier proposed the Combustion Theory which was based on sound mass measurements.
1794 - Joseph Louis ProustPublished the Law of Definite Proportions which states that a compound is composed of exact proportions of elements by mass regardless of how the compound was created.
1803 - John Dalton created the first proposal of atomic theory.
1832 - Michael Faraday studied the splitting of molecules with electricity.
1897 - J.J. Thompson discovered the electron.
1898 - Marie and Pierre Curie discovered the radioactive elements polonium and radium.
1909 - Ernest Rutherford developed the theory of the structure of an atom.
1909 - Robert Millikan discovered the charge and the mass of an electron.
1922 - Neils Bohr created an atomic model made up of successive orbital shells of electrons.
1930 - Erwin Schrodinger viewed electrons as continuous clouds and introduced wave mechanics as a mathematical model of the atom.
1932 - James Chadwick discovered the neutron.
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