History of Chemistry

Elixir of Life

Jan 1, 1520

Alchemists wanted to find a chemical concoction to cure ailements and live longer
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Coulomb's Law

Jan 1, 1700

Charles Coulomb stated that 2 given paricles separated by a certain distance, the force of attraction or repulsion is directly proportional to the product of the two charges and is inversely proportional to the distance between charges.
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Dalton's Atomic Theory

Jan 1, 1803

All matter is composed of atoms that are small and indivisble.
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Vacuum Tube

Jan 1, 1854

Heinrich Geissler creates the first vacuum tube.
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The proton

Jan 1, 1885

Eugene Goldstein discovered postive particles by using a tube filled with hydrogen gas.
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The electron and its properties

Jan 1, 1897

J.J. Thomson placed the Crooke's tube within a magnetic field. The cathode rays were negative.
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Mass of electron

Jan 1, 1909

Robert Millikan using charged oil droplets, put them into an electrically charged field. It found its mass
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3 types of radioactivity

Jan 1, 1911

Ernest Rutherford sent a radioactive source through a magnetic field and found the alpha rays (positive), the beta rays (negative), and the gamma rays (neutral) of radioactivity
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Bohr Model

Jan 1, 1913

Niels Bohr created a model that depicts an atom as a small, charged nucleus surronded by electrons.
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