-
460
Democrtus
460-370B.C. was the first person to propose the idea that matter was not infinetly divisible. -
Cathode Ray Tube
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. -
John Dalton
A school teacher in England, marks the beginning of the development of modern atomic theory. -
J.J. Thompson
He began a series of cathode ray tube experiments in the 1890's to determine the ratio of its charge to its mass. -
Ernest Rutherford
he discovered the radio activity -
Robert Millikan
american physicts, determined the charge of an electron
