-
400
Democritus
Democritus found all matter is made of atoms. He hypothosized that atoms differ in size and are indestructible. -
John Dalton
Dalton suggested that all matter is created of atoms and that compunds are formed when you combine two or more different atoms. -
J.J. Thomson
In 1904 Thomson suggested his atomic model. -
Robert Millikan
Millikan measured the charge of an electron by using his oil drop experiment. -
Neils Bohr
Bohr was the first to discover that electrons travel in different orbits. -
Ernest Rutherford
Rutherford was credited for splitting the first atom. -
James Chadwick
James Chadwick discovered the nuetron.
