Chemistry Timeline

Isaac Newton theorized a universe with small solid masses in motion

Oct 1, 1704

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Dalton proposed "Atomic Theory, that the world was made up of atoms with measurable mass

Oct 18, 1803

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G.J. Stoney theorized that electricity was made up of negatively charged electrons

Oct 18, 1894

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Thomson uses a cathode ray tube to determine the charge to mass ration of an electron

Oct 21, 1897

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Marie Curie discovers radio-activity

Oct 21, 1898

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Rutherford studied uranium and thorium, and discovered alpha and beta particles.

Oct 21, 1898

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Soddy discovered isotopes and half-lifes.

Oct 21, 1900

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Nagaoka proposed the "Saturnian" model of the atom.

Oct 21, 1903

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Bohr introduces the "Bohr Model" which depicted an atom as having a small positively charged nucleus surround by electrons that travel in a circular orbit around it. He also worked on the Manhattan Project.

Oct 21, 1913

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