History of Atomic Model

John Dalton

Oct 21, 1803

John announces his famous atomic theory

Thompson Discovers the neutron

Feb 6, 1897

Announcement the model of the atomic atom

Jan 1, 1911

Ern announces the model of the atomic atom

Niels Bohr

Aug 13, 1913

Bohr published his model of atomic structure in 1913

Predicts Neutron

Jul 13, 1920

Ern predicts the existence of the neutron