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Democritus Theory
All matter consisted of very small particles that couldn't be divided -
Dalton Model
All matter is made up of individual atoms, which cant be divided. -
Thompson Model
Thompson discovered that atoms are made of even smaller particles. He discovered the electron, and made the plum-pudding model. -
Hantaro Nagaoka
All atoms have a central nucleus. Electrons orbit around it. -
Rutherford Model
All of an atoms positive charge is located in its nucleus. -
Bohr Model
Neils Bohr found that a electron can move from one energy level to another, when atoms gain or lose energy. -
Louis de Broglie
porposed that electtrons have some properties of the waves -
Electron Cloud Model
Erwin Schrodinger developed equations to describe motions of electrons in atoms. This would lead to the electron cloud model. -
James Chadwick
confirmed existence of neutrons, with no charge
