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Atomic Theory Timeline

There were several people involved in the Atomic Theory. This timeline is by no means complete, it only contains 41 of the scientists who worked on it. You will notice there is no 200-800 AD time period. This is because there are no scientists who contributed in that period of time. To learn more about a scientist just rest your mouse on their name.

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400 BC to 200 AD801 AD to 1400 AD1401 AD to 1930 AD1931 AD to Present
Cavendish discovered and studied Hydrogen, the lightest of the elements. Dalton said that matter is made of atoms of different weights. Stoney suggested that electricity is made of electrons. Dmitri found that an element's properties are related to the element's weight. Goldstein used Cathode tubes to study rays with properties opposite those of the electron. Thomson used the Cathode tube to determine the charge to mass of electrons. Nagaoka gave the model of an atom as electrons orbiting around a proton. Abegg discovered that a stable electron configuration makes noble gases unreactive. Aston discovered the existance of isotopes. Schrodinger believed electrons formed a clouds around the nucleus. Newton proposed a universe with small solid matter in motion. Avogadro clammed that equal volumes of gas should have the same number of molecules. Johannes introduced the idea of weak bonds between molecules. Maxwell suggested that fields of electricity and magnetism fill the void between electrons and the nucleus. Plucker built one of the first Cathode tubes. Zeeman studied the spliting of sudium when held between strong magnetic poles. Crookes discovered several properties of the Cathode ray. Millikan determined the charge of the electron. Bohr's ideas of atomic structure helped set up the periodic table. Rutherford did the gold foil experiment and assumed that electrons were located outside the nucleus. Broglie discovered that electrons were similar to both particles and waves. Moseley found that the atomic number was equal to the number of protons. 1401 AD to 1930
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