Mineral Species containing Protactinium (Pa)

**Protactinium (Pa) Element Properties**
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

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.

There are no minerals containing Protactinium (Pa)