Plural: actinons
Any of a series of radioactive elements with atomic numbers 89 through 103
actinometric · actinometrical · actinometry · actinomorphic · actinomycete · actinomycosis · actinon · actinotherapy · actino-uranium · act in violation of the law · actio · actio in distans · action
Radioaktivni plemeniti gas, jedan od izotopa radona.
Izotop radona, radon-219