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5th Century, Democritius stated that Atoms are present in atmosphere in no specific size.
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Dalton stated that "Atoms cannot be divided into small pieces and can't be destroyed."
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Thomson said that Atoms can be divided to smaller pieces proving Dalton's theory wrong. He called it Plum Pudding
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Built the Crookes Tube that detected raoiactive emmisions of elements.
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Discovered X rays and radioactivity thus helping scientists perfect atomic model.
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Discovered the Atomic Nucleus, while attempting to examine the structure of the atom with the Geiger-Marsden Effect
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Discovered how electrons have stable orbits around nucleus, while modifying the Rutherford Model.
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Chadwick discovered the Neutron.
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The current model of the atom is accepted is by Niels Bohr
