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He's the first to suggest that matter cannot be infinitely divided.
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(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
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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
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designed a series of CRT Experiments at Cambridge to determine the ratio of the particles charge to its mass
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Designed an oil-drop apparatus to determine the charge of an electron
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He studied how positively charged a-particles interacted with solid matter
