Name |
Protactinium |
Symbol |
Pa |
Atomic Number |
91 |
Atomic Mass |
231.04 amu |
Number of Protons |
91 |
Number of Electrons |
91 |
Number of Neutrons |
140 |
Melting Point |
1600 degrees Celcius |
Boiling Point |
Unknown |
Normal Phase |
Solid |
Family |
Rare Earth Metal |
Period |
7 |
Group |
N/A |
Origin of Name |
From the Greek word, protos, meaning first |
Date & Place of Discovery |
Discovered by Otto Hahn and Lise Meitner in Berlin, Kasimir Fajans in Germany, and John Cranson, A. Fleck and Fredrich Soddy in Glasgow all in 1917 |
Interesting Facts |
|
Common Uses |
There are no know uses outside the lab because it is highly radioactive and toxic |