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Period: to
Atom revolution
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Daltons model
John Dalton sees atoms as super tiny, unbreakable particles, that dont have an internal structure. chemical elements are made of atoms.
the atoms of an element are identical in their masses
atoms of different elements have different masses.
atoms only combine in small, whole number ratios such as 1:1, 1:2, 2:3 and so on.
atoms can be neither created nor destroyed -
Thomson model
British scientist J.J Thomson discovers the electron, which has electrons around a sphere of positive electrical charge. -
Hantaro Nagaoka idea
Hantaro Nagaoka a japanese physicist, said that an atom has a central nucleus and that electrons move in circular orbits like rings. -
Rutherford model
A New Zealand physicist discovers that atoms have small, dense, positively charged nucleus and that the electrons move around it. -
Bohr model
In this model, Bohr says the electron moves in circular orbits away from the nucleus -
Louis de Broglie
Louis de Broglie says that moving particles like electrons have properties of waves -
Electron cloud model
Erwin Schrodinger comes up with mathematical equations that describe the way electrons move in atoms -
James Chadwick
James Chadwick an enlish physicist, confirms that neutrons exist and have no charge. Also that Atomic nuclei have neutrons and protons
