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465 BCE
Democritus
hypothesised that every thing is made up of tiny dicrete particles which cannot be broken.These were called atoms -
460 BCE
Aristotle
Said that atoms can be divided into smaller parts -
John Dalton
Suggested that matter is made up of small discrete particles like balls -
Robert Brown
Observed some dead pollen in water were constantly moving.Known as Brownian motion -
Albert Eienstein
Explained dead pollens were moving because they were being bombarded by water particles