Actinium is a highly radioactive actinide used mainly in research and in developing targeted alpha-particle treatments.
Atomic number
89
Category
Actinide
Period
7
Group
f-block
State
Solid
Fun facts about Actinium
It gives its name to the actinide series.
Actinium compounds generally favour the +3 oxidation state.
Some isotopes can serve as parents for chains of therapeutic alpha emitters.
Common uses of Actinium
Targeted alpha-therapy research
Neutron-source research
Where Actinium sits in the periodic table
Actinium 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 Ac with atomic number 89 and the listed atomic mass [227]. The summary, facts, and uses above keep those element properties together in one reference.