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Democritus
He discovered the existence of invisible atoms, characterized only by quantitive properties, size, and shape and motion. -
John Dalton
Proposed the Atomic Theory stated atoms of a given element posesses unique characteristics. -
JJ Thomson
Discovered electrons using a cahtode ray tube,changed model to the plum pudding model. -
Ernest Rutherford
DEveloped planetary model where the nucleus is in the center. -
Niels Bohr
Disocvered a small positively charged nucleus that is located in the center. -
Schrodinger
Develpoed mathematical equations to describe the motion of electrons. -
Chadwick
Proved existence of neutrons.