Atomic Theory Timeline

Events

Democritus

430 BC

Dalton

1803

Thomson

1896

Millikan

1898

Rutherford

1898

Bohr

1913

He proposed a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities. Energy is transferred only in certain well defined quantities. Bohr applied quantum Rutherford's atomic structure and assuming that the electronic travel in stationary orbits defined by their angular momentum. Bohr's atomic model is basically considered as a primitive hydrogen atom