Yes. All of the actinides are radioactive.
radioactive
The actinides all have a numerical ratio of protons to neutrons that makes their atomic nuclei unstable. This causes those nuclei to expel some type of particle (alpha or beta) and this causes a transmutation into another less massive (and usually more stable) element. This is radioactive decay.
All actinides are radioactive elements and some are man made.
All actinides are radioactive elements and some are man made.
Some lanthanides are radioactive, such as promethium. However, most lanthanides found in nature are stable.
The actinides
The family of radioactive elements is called the Actinides. This group includes elements such as uranium, thorium, and plutonium, which are known for their radioactive properties.
Actinoids are: Th, Pa, U, Np, Am, Cm, Bk, Cf, Es, Fm, Md, No, Lr.
All of the actinides are radioactive, and almost all are synthetic.
radioactive
All are radioactive and all of them can show the oxidation state of +3
radioactive elements that belong to the periodic table group of actinides. They have increasing atomic numbers starting from actinium (Z=89) to lawrencium (Z=103). Actinides are often used in nuclear reactors and are known for their radioactive properties.