
I think french and english doesn't match, radium is a element and "radioactivé" is the physical decomposition which occurs with element like radium / uranium / aquarium etc.

C'était Marie Curie qui a découvert la radioactivité -> C'est Marie Curie qui a découvert la radioactivité
ou
C'était Marie Curie qui a découvert la radioactivité -> C'était Marie Curie qui avait découvert la radioactivité
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