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Atomic Theory

Development of Atomic Theory

TermDefinition
Democritus Greek philosopher; first one to name atoms(atomos, which means indivisible)
Joseph Thomson In 1904,he discovered that atoms had negatively charged particles, electrons; he made a model of an atom, the "Plum-Pudding" model
Ernest Rutherford In 1911, he theorized that atoms have their charge concentrated in a small nucleus, discovered it with the "Gold Foil" experiment, discovered that an atom is empty space
Neils Bohr In 1913,he hypothesized that electrons orbited around the nucleus; the "Bookshelf" model
Current Model- The Electron Cloud Model the currently accepted model of atomic structure; electrons do not follow fixed orbits, but are found frequently in certain areas
Created by: John Campbell
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