Marie Sklodowska-Curie and her husband Pierre Curie in 1898
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radium was not invented, it was discovered.
Bequerel was the first to note radioactivity, in 1896. Curie discovered radium in 1898, after experiments with uranium and then pitchblende.
Radium was more or less discovered by accident while the Curies were looking for Uranium in samples of Pitchblende. In 1898, they discovered in tiny amounts, Polonium in July, and Radium in December.
marie curei
1898