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Democritus
Democritus was a Greek philosopher. He started atomic theory and named it Atmos witch means atom. -
John Dalton
John Dalton was an English chemist. He is famous for many things including his work on color blindness. His theory on atomic theory was this: 1) Atoms of a given element are identical in size, mass, and other properties. 2) Atoms cannot be subdivided, created, or destroyed. 3) Atoms of different elements combine in simple whole-number ratios to form chemical compounds. -
Sir William Crookes
Crookes was an English man who was experimenting on vacuum tubes. Using his Crooke's tube he discovered that atoms are negatively charged. -
J.J Thomson
Thomson took Crooke's tube and experimented on it. He called his new model the Plumb Pudding Model. In this way he discovered protons. -
Rutherford
Rutherford was an English scientist. With his gold foil experiment he discovered that electrons are outside of the atom. -
Neils Bohr
Bohr was a student of Rutherford. He made the Electron Cloud Model. Electrons, as a quantum mechanically-influenced model, we shouldn’t know exactly where they are, and hence describe their probable location around the nucleus only as an arbitrary cloud.
