who discovered radium

Radium was discovered by Marie Skłodowska-Curie and her husband Pierre Curie on December 21, 1898. They discovered it in a uraninite (pitchblende) sample from Jáchymov after removing uranium from the mineral and finding that the remaining material was still radioactive. This led them to isolate radium as a new element that emitted rays, which is reflected in the name "radium" derived from the Latin word for ray. They announced their discovery to the French Academy of Sciences on December 26, 1898. Later, Marie Curie isolated radium as a pure metal in 1910 through electrolysis of radium chloride.