| 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 |
WebElements,
ChemiCool |