Pa Protactinium Index (original) (raw)
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.
Remarks
Radioactive, silvery metal found naturally in uranium ores. Attacked by oxygen, steam, and acids, but not by alkalis. Little used. Primarily occurs as a trace amount (a few ppm) in uranium minerals where it is a decay product of uranium
References
Emsley, J., 1991; THE ELEMENTS : Sec. Ed., Clarendon Press, Oxford, 251 p.
See Also