History of the Atom Timeline by Alyssa Turner

Democritus

460

democritus-He discovered that atoms physically, but not geometrically, indivisible.
-Back then there were no scientific methods
-a marble

dalton

Feb 25, 1800

-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

Feb 25, 1897

-he discovered subatomic particle in the atom.
-the moving particle will be acteed on by a force equal to HEV.
-positive particles

rutherford

Feb 25, 1911

-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.