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-John Dalton is the one in the back he has developed the first atomic theory of matter in 1803. -J.J Thomson discovered the electron in a series of experiments, he thought that a model of the atom as a sphere of positive matter in which electrons are positioned by electrostatic forces. (1904)
-Rutherford had made the gold foil experiment which discovered that every atom contains a nucleus that has positive charge and most of the mass is concentrated (1909) -Niels Bohr made the contribution to understanding the atomic structure (1913)
In 1926 Erwin Schrödinger, an Austrian physicist took the Bohr atom a bit further and made the quantum model. They can see it better because they had advance technology.
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