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Democritus described that matter is made from tiny building blocks
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He found that atoms of same substances are the same and that mixtures of the diferent atoms make up compounds.
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Dmitry Mendeleyev and Lothar Meyer discovered that elements had different types of atoms. This classification was the begining of the periodic table.
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Sir Joseph Jon Thompson and others did experiments with electricity, proved that atoms existed.
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Ernest Rutheford and Niels Bohr designed a model that included protons and nucleus.
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in 2016 4 new types of atoms were found. These were the last discoveries of new atoms