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betaParis, France Monday Dec 26, 1898 Marie Curie
The Curies Announced The Existence of a Second Element, Which They Named "radium"
Paris, France Monday Dec 26, 1898 On 26 December 1898, the Curies announced the existence of a second element, which they named "radium", from the Latin word for "ray". In the course of their research, they also coined the word "radioactivity".