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Democritus made the original findings of an atom and that atoms are the smallest and most indestructible object in the world
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He came up with the first universal atomic thoery
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when he was trying to figure out what cavendish rays were he discovered electrons
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he arranged 63 elements by atomic mass
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he accidentally discovered positive rays
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He came up with the idea of quantum theory
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he came up with the idea of radiation and atomic structure \
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Found out how to measure electric energy in elctrons
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he made quantum mechanics while max planck made quantum theory
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he created wave mechanics also known as schrödiner's equation Off atoms and all that he made my favorite thing ever and that a paradox look up schrödinger's cat if you want to know more
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He discovered the neutron and actually made the us want to speed up the Manhattan Project