Several shortened names were soon suggested for the three emanations: exradio, exthorio, and exactinio in 1904; radon, thoron, and akton in 1918; radeon, thoreon, and actineon in 1919, and eventually radon, thoron, and actinon in 1920.
Der blev foreslået flere navne for disse tre gasser: exradio, exthorio, og exactinio i 1904; radon, thoron, og akton i 1918; radeon, thoreon, og actineon i 1919, og radon, thoron og actinon i 1920.