-
200
440 BCE-Democritus
His theory was if kept dividing something you would get to some thing which can't be divided. He called this an atom. -
201
382 BCE-Aristotle
Aristotle belived that particles could be infinety cut. -
Dalton
Dalton thought that atoms of the same element are exactly alike. -
Thomson
Thomson thought electrons were mixed thoughout the atom like "plums in pudding." -
Rutherford-1909
Rutherford conducted an experiment in which he shot particles on a thin sheet of gold. to his suprise some bounced back. -
Rutherford-1911
Rutherford created a model in which eletrons circle a dence center called the nuculous. -
Bohr
Bohr though that electrons rotated around the nuculous in certain paths. -
Schrodinger and Heisenberg
Schrodinger and Heisenberg consructed a model which introduced electron clouds. electron clouds are places were the electron is likely to be found.