અણુ ક્રમાંક 89 થી 103 સાથેના કિરણોત્સર્ગી તત્વોની શ્રેણીમાંથી કોઈપણ,

actinon's Usage Examples:

(T) are still in use today, as is thoron (Tn) for radon-220 (though not actinon; An is usually used instead for a generic actinide).

1904; radon (Ro), thoron (To), and akton or acton (Ao) in 1918; radeon, thoreon, and actineon in 1919, and eventually radon, thoron, and actinon in 1920.

that time, radon only referred to the isotope 222Rn, whereas the names actinon and thoron denoted 219Rn and 220Rn, respectively.

219Rn is derived from the most stable isotope of actinium (227Ac)—named "actinon"—and is an alpha emitter with a half-life of 3.

Synonyms:

group, actinide, actinoid, grouping,

Antonyms:

zygomorphic, inactivity,