Democritus- 450 BC, first mention of Atom.
John Dalton- 1803, solid spheres, can't be split, make up everything, each element contained identical atoms
JJ Thompson- 1897, discovered particles with negative charge (electrons), came up with the plum pudding model
Ernest Rutherford- 1907, investigated if radiation was ever reflected back by metals, discovered most of an atom is empty space
Ernest Rutherford- 1911, came up with modern nuclear model
Neils Bohr- electrons were fixed distance from nucleus, orbiting in shells, nucleus contains protons.
James Chadwick- 1932, discovered neutrons
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