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440
Democritus
Coined the term atom -
Lavoissier
Law of consercation of mass -
Proust
Law of Definite proportions -
Dalton
First atomic theory
solid ball model -
Becqerel and Curie(s)
Discovered radiation and radio activity -
Thomson
Discovered neutron -
Rutherford
Discovered nucleus and proton
gold foil experiment
nuclear model -
Einstein and Planck
Light has dual nature
photoelectric effect experiment -
Milikan
Measured mass and charge of election
oli drop experiment -
Bohr
Atomic emission spectra
plantary model -
Chadwick
Discovered neutron -
De Broglie
Electron has dual nature -
Heisenberg
Uncertainty Principle -
Schrodinger
Wave equation
cat experiment
quantum model