Atomic Mass : 231.03588
Atomic Number : 91
Name Origins : Greek, protos = "first."
Year Discovered : 1917
Discovery Credits : Discovered by Otto Hahn and Lise Meitner at Berlin, by K. Fajans at Karlsruhe, Germany, and by F. Soddy, J. A. Cranston, and A. Fleck at Glasgow, Scotland.
More Details