Yes. All of the actinides are radioactive.
Yes.
radioactive
All actinides are radioactive elements and some are man made.
All actinides are radioactive elements and some are man made.
The actinides
The actinides
All of the actinides are radioactive, and almost all are synthetic.
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.
radioactive
All are radioactive and all of them can show the oxidation state of +3
actinides
All the actinides isotopes are radioactive; and the majority are artificial isotopes.