GENERAL KNOWLEDGE

Detailed explanation-1: -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.

Detailed explanation-2: -Marie and Pierre Curie and the discovery of polonium and radium.

Detailed explanation-3: -Marie Curie: Discovery of Radium-BRIEF Exhibit. o study the rays, Marie Curie used a property that Becquerel had discovered. When uranium rays passed through the air near an electrical measuring instrument, he found, the instrument detected a difference.