-
460
Democritus
democritus-He discovered that atoms physically, but not geometrically, indivisible.
-Back then there were no scientific methods
-a marble -
dalton
-He discovered that all matter is composed of tiny indivisible elements.
-"billard ball model" he thought the atom looked like billard ball from pool. -
thomson
-he discovered subatomic particle in the atom.
-the moving particle will be acteed on by a force equal to HEV.
-positive particles -
rutherford
-He discovered electrons and protons are uniformly mixed throughout the atom.
-He used Thonsons hypothesis
-all the protons in the neucleus and the electrons orbited around the neucleus like panets around the sun.
