Protactinium is a scarce, highly radioactive actinide with little use outside specialised scientific research.
Atomic number
91
Category
Actinide
Period
7
Group
f-block
State
Solid
Fun facts about Protactinium
It occurs naturally as an intermediate in uranium decay chains.
Its chemistry is difficult to study because samples are rare and radioactive.
The +5 oxidation state is important in many of its compounds.
Common uses of Protactinium
Fundamental actinide research only
Where Protactinium sits in the periodic table
Protactinium belongs to the actinide series in period 7 and the f-block of the periodic table. Under the conditions represented in this reference, its state is solid.
Quick chemistry revision
For quick revision, pair the symbol Pa with atomic number 91 and the listed atomic mass 231.04. The summary, facts, and uses above keep those element properties together in one reference.