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Developed the Atomic Theory
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Developed stoiciometry
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Developed the law of difinate proportion
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Founded the atomic theory in 1800.
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Found the chemical thallium and identifyed the first sample of helium.
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In 1896 Becquerel discoved natural radioactivity. Alsio he studies the absorbtion of light by crystals. In 1903 he dicovered spontanious radioactivity and won the Nobel Peace Prize
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Found element and named it polonium and in 1896 she found that uranium salts admitted rays similar to x-rays.
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Developed the plum pudding model
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Measured the single charge of an electron.
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Discovered atoms charged nuclues
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In 1913 Bohr developed the model of the atom he discovered and named after him.
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Developed the theory of atomic numbers for a more accurate positioning of the table of elements.
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Chadwick proved the existince of nutrons in 1932.
