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400
atomic theory
this time line is about atomic theory. -
400
Democritus
he was a student of socrates and made observations. he theorized that everything is made of small indivisible particles called "atomos". -
john dalton
john dalton made observations called dalton's potulates. he theorized three things, everything made of atoms, atoms can't be broken down (solid sphere), atoms of each element are unique. -
JJ thompson
he made the cathode ray tube experiment. he theorized that there are electrons, plum pudding model or known as the choc. chip cookie model. -
Earnest Rutherford
he did the gold foil experiment, atoms mostly empty space w/ small, positive, dense nucleus. -
neils bohr
he made the bohr model and the electrons energy levels. -
quantum/modern theory
many scientists contributed and they concluded that electron, ion, isotopes, and that there is a uncertainty principle.
