1 jan 1913 ano - 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)