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460
Democritus
He's the first to suggest that matter cannot be infinitely divided. -
Aug 25, 1000
Aristotle
(384-322 BC) He disagreed with Democrtius' idea of that atoms move through empty space, he denied the existence of atoms due to personal ideas about nature -
John Dalton
John Dalton was an englishman who marked the beginning of modern atomic theory, and revised Democritus' ideas with research, he concluded that atoms are the smallest particles of matter, and they're indivisible and indestructible -
J.J.Thompson
designed a series of CRT Experiments at Cambridge to determine the ratio of the particles charge to its mass -
Robert Millikan
Designed an oil-drop apparatus to determine the charge of an electron -
Ernest Rutherford
He studied how positively charged a-particles interacted with solid matter
