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First to propose that atoms exist
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Developed "Dalton's Atom Theory"
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Discovered the element Thallium
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Developed and created the Crookes tube
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He discovered radioactivity
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Discovered the electron
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Discovered Polonium and Radium in 1898 while trying to investigate radioactivity in pitchblende (Uranium oxide)
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Discovered the charge of a single electron
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Developed the idea of quantum physics and created the Bohr Atomic Model
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Developed the wave equation for quantum physics
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Discovered the neutron
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Discovered the nucleus
