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He observed that atoms have always been and will be in motion.
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He observed that all atoms of an element were identical different elements had atoms of differing size and mass.
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He discovered the electron and created the Plum Pudding Model.
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He created the Rutherford model which shows the nucleus of an atom containing protons and neutrons being orbited by shells of electrons.
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Observed that their is a small positively charged nucleus surrounded by orbiting electrons.
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Measured the elementary electronic charge.
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He discovered neutrons in atoms. He showed that neutrons do not have a positive charge nor a negative charge. Though they contribute the atomic weight with the same effect as a proton.
