-
Joseph Proust (France)
law of definite proportions -
John Dalton (England)
discovers atoms -
Amadeo Avagadro (Italy)
gases are made up of atoms and can be accounted for -
Henri Becquerel (France)
discovered radioactivity -
JJ Thompson (England)
electron discovery
plumb pudding model
isotopes- chemically similar, but different in mass
2 kinds of neon -
Max Planck (Germany)
introduced hypothesis that oscellating atoms absorb and emit energy -
Robert Millikan (US)
measured charge on single atom
oil-drop experiment -
Lord Rutherford (England)
charge of electron is negative
photoelectric effect -
Max Born (Germany)
definition of quantity of heat -
Louis de Broglie (France)
electron waves theory -
Erwin Schrodinger (Austria)
atoms organized through electric clouds instead of power level -
Werner Heisenberg (Austria)
uncertainty principle -
Walter Bothe (Germany)
momentum and energy are conserved at atomic level
cosmic rays consist of massive particles -
Wolfgang Pauli (US)
energy and momentum lost when electron is expelled from the nucleus -
James Chadwick (England)
discovered neutron
