aktinoidiset
Aktinoidiset, also known as actinides, are a series of 15 metallic chemical elements in the periodic table, ranging from actinium (atomic number 89) to lawrencium (atomic number 103). These elements are characterized by the filling of the 5f electron shell. They are all radioactive, with no stable isotopes. The name "actinide" comes from actinium, the first element in the series.
The actinides are typically found in the f-block of the periodic table, although some classifications place
The most well-known actinide is uranium, which is used as fuel in nuclear power plants and in