You searched for: “actinon”
actinon (s) (noun), actinons (pl)
A radioactive isotope of radon: An actinon is created by the disintegration of actinium. It has a mass number of 219 and a short life span, or a half-life of 3.96 seconds.
This entry is located in the following unit: actino-, actin-, actini-, -actinal, actis- + (page 4)