Atomic Theory Case Timeline Model

Calla, Cally, Cheli

Events

Democritus adds to the Atomic Theory

400 BC

John Dalton finds that all matter was composed of atoms

1803

James Chadwick was born in Cheshire, England

October 20, 1891

J.J. Thompson discovers the electron

1897

Chadwick Graduated from Manchester University’s Honours School of Physics

1911

Ernest Rutherford discovered that atoms have charges in the nucleus

1911

Chadwick recieved his Master of Science degree

1913

Niels Bohr discovers the Bohr Model- Electrons orbit the nucleus

1913

Chadwick was titled Rutherford’s Assistant Director of Research in the Cavendish Laboratory

1923

Erwin Schrodinger creates the Quntum Mechanical Model of an atom

1926

John Chadwick discovered the neutron in atoms

1932