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Proposed the idea of the atom as an indivisible particle -
Introduced the "marble" model, suggesting atoms are indivisible, solid spheres -
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Demonstrated that atoms could be influenced by electric and magnetic fields -
Discovered canal rays (protons), showing atoms had positive charges -
Discovered the electron and proposed the "plum pudding" model -
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Measured the charge of the electron via the oil drop experiment, confirming the quantization of charge -
Proposed the "nuclear" model with a dense central nucleus surrounded by electrons -
Introduced the "solar system" model where electrons orbit the nucleus in defined energy levels -
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Developed the "electron cloud" model using wave mechanics, depicting probabilistic electron locations -
Formulated the Uncertainty Principle, showing limits in measuring atomic properties precisely -
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Discovered the neutron, refining the "electron cloud" model to include neutrons in the nucleus -
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