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460
Democritus
Developed the Atomic Theory -
Lavoisier
Developed stoiciometry -
Proust
Developed the law of difinate proportion -
Dalton
Founded the atomic theory in 1800. -
Crookes
Found the chemical thallium and identifyed the first sample of helium. -
Becquerel
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 -
Curie
Found element and named it polonium and in 1896 she found that uranium salts admitted rays similar to x-rays. -
Thomson
Developed the plum pudding model -
Millikan
Measured the single charge of an electron. -
Rutherford
Discovered atoms charged nuclues -
Bohr
In 1913 Bohr developed the model of the atom he discovered and named after him. -
Moseley
Developed the theory of atomic numbers for a more accurate positioning of the table of elements. -
Chadwick
Chadwick proved the existince of nutrons in 1932.
