History of Chemistry

Alchemists

300

Alchemist, from 300 BC to 300 AD, attempt to make gold from cheap metals.
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Elixir of Life

Jan 1, 1520

Alchemists want to make a liquid that cures all sickness and allows immortality
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Atomic Theory

Jan 1, 1803

Dalton publishes his theory that states that all matter is made of atoms.http://www.columbia.edu/itc/chemistry/chem-c2507/navbar/chemhist.html

Discovery of Protons

Jan 1, 1885

Goldstien discovers postively charged particles, named protons.
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Discovery of Elctrons

Jan 1, 1897

Thomson discovers and names the electron.
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Radioactivity and New Atomic Model

Jan 1, 1911

Rutherford, by sending radiactive particals toward a gold plate, discoveres three tpyes of radiation: alpha, beta, and gamma. He also concludes that the atom is mostly empty space, leading to the creation of a new atomic model.
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Most Recent Atomic Model

Jan 1, 1913

Bohr introuced the most recent and most accepted atomic model.
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Disocvery of Neutrons

Jan 1, 1932

Chadwick discoveres the neutron.
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Atrifcal Elements

Jan 1, 1934

Irene Curie and Frederic Joliot-Curie discover that by bombording elements with alpha particles, they can create new elements.
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