Assertion: radon's isotope | /r/Synonym | thoron
Facets:
value: commonly
type: DEGREE
Source sentences:
text: The name radon is sometimes reserved for this isotope to distinguish it from the other two natural isotopes, called thoron and actinon, because they originate in the thorium and the actinium series, respectively.
text: The 220Rn isotope is a natural decay product of the most stable thorium isotope (232Th), and is commonly referred to as thoron.