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Democritus established basis for Atoms.
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Thales of Miletus, discovered amber by rubbing soft object against it.
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Was the year that the first scientifically recognized atom was discovered this atom was phosphorous.
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Franz-Joseph Müller von Reichenstein discovered Tellurium
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Dmitri Mendeleev discovered a way of collating the elements, The system was in the order of Atomic weight, then position into rows and columns sourced on there chemical and physical properties.
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The gas Argon was discovered by Lord Rayleigh.
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J.J Thomson discovered the structure of the atom.
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The successful scientest J.J Thomson discovered the electrons that live in an atom.
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Mosely found that the periodic table would be better if it was ordered by atomic number instead of atomic weight.
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James chadwick discovered the neutron in the atom.
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Man made nuclear reactor was developed by Enrico Fermi.
