How did Marie Curie discover radium and polonium?

On April 20, 1902, Marie and Pierre Curie successfully isolate radioactive radium salts from the mineral pitchblende in their laboratory in Paris. In 1898, the Curies discovered the existence of the elements radium and polonium in their research of pitchblende. read more

Marie Curie's discovery of radium and another element, polonium, was a long process that she undertook with her husband, Pierre. She was interested in Becquerel's work, which noted that uranium gave off rays that could penetrate objects but provided no explanation for why that occurred. read more