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460-370B.C. was the first person to propose the idea that matter was not infinetly divisible.
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the accidental discovery of the cathode ray led to the invention of the most important technological and social developments of the 20th century-the television. Scientists continued their research using cathode ray tube and by the end of the 1800's they were fairly convinced.
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A school teacher in England, marks the beginning of the development of modern atomic theory.
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He began a series of cathode ray tube experiments in the 1890's to determine the ratio of its charge to its mass.
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he discovered the radio activity
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american physicts, determined the charge of an electron
