Investigating Chemical Elements

German physicist Wilhem Roentgen and French physicist Henri Becquerel

Period: Nov 8, 1895 to May 15, 1896

They have been working on radioactivity before Marie and Pierre joined their research.

Marie and Pierre worked together investigating radioactivity.

Period: Jun 15, 1896 to Dec 15, 1903

The Curies joined Roentgen and Becquerel's research

Announced the discovery of Polonium

Jul 15, 1898

The Curies discovered a new chemical element

Announced the discovery of Radium

Dec 15, 1898

The Curies discovered another chemical element