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He was the first to investigate the basic principles of atoms.
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He thought all things were made up of fire, air, water, and earth.
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He developed the first atomic theory.
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He contributed to Democritus' atomic theory.
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He developed atomism, a new atomic theory.
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He discovered radioactivity.
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He discovered the electron.
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He found the charge of an electron.
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He discovered the proton and thought up the nucleus.
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He came up with the electron orbit theory.
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He discovered isotopes.
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He used math to determine the probability of an electron being in a certain place in an atom.
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He discovered the neutron.