-
John Dalton
-said that all matter is made up of atoms
-formed the atomic theory
-stated 5 principles -
Henri Becquerel
-discovered that uranium containing materials produced x-ray radiation
-won nobel prize in 1903 -
The Curries
-discovered radium and polanium -
J.J Thomson
-discovered the electron
-made the plum-pudding model
-used the cathode ray experiment -
Robert Millikan
-discovered the charge of an electron and its mass -
Ernest Rutherford
-stated that all mass of an atom were in a small positively charged ball at the center of the atom
-he used the gold foil experiment -
Neil Bohr
-said that electrons moved around in a large orbit
-he used the planetary model -
Quantum Model
-probability area an electron may be located -
James Chadwick
-discovered the neutrally charged neutron
