1 янв 1913 г. - 1913 - Renaming of brevium to protactinium Hahn and Lise Meitner discover residues of "brevium" (an element previously named by Kasimir Fajans and Oswald Göhring) in residues of pitchblende ore and suggest a new name for the element: "protoactinium" (now protactinium)
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1 янв 1913 г.
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