Element discovered by Marie Curie (6)

I believe the answer is:

radium

(Other definitions for radium that I've seen before include "Radioactive element discovered by the Curies" , "Metallic element discovered by the Curies" , "Ra (atomic number 88)" , "Chemical element, Ra" , "Curie-found element" .)

I've seen this clue in The Wall Street Journal.

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