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400
Democritus starts the atomic race
Democritus made a prediction about how atoms were and looked like -
Dalton adds on
Dalton does experiments and improves on democritus's theory -
the plum pudding model
J.J. thomson discovers electrons and makes the plum pudding model of the atom -
Rutherford
He proved that an atom must contain a central nucleus.This was further evidence that an atom contained smaller pieces. -
bohr
He proved that electrons occupy particular orbits or shells around the nucleus of an atom
