|Origin of Name
||From the Greek protos, meaning first, combined with actinium
|Date and Place of Discovery
||In 1917 (see below)
||Otto Hahn and
Lise Meitner in Berlin
Kasimir Fajans in Germany and
John Cranson, A. Fleck and Fredrich Soddy in Glasgow.
- Protactinium bromide
- Protactinium chloride
- Protactinium fluoride
- Protactinium iodine
- Protactinium oxide
- It is one of the most rare and expensive elements.
- It is superconductive at temperatures below 1.4 K.
- It has 29 radioisotopes which have been characterized.
- The isotope, Protactinium-231, formed by
alpha decay of Uranium-235, might create a
nuclear chain reaction which might be used in a nuclear weapon.
||There are no known uses outside of the laboratory because of its high radioactivity and high