Naturally occurring iodine (53I) consists of one stable isotope, 127I, and is a mononuclidic element for atomic weight. Radioisotopes of iodine are known from 108I to 147I. The longest-lived of those, 129I, has a half-life of 16.14 million years, which is too short for it to exist as a primordial nuclide.
Naturally occurring iodine (53I) consists of one stable isotope, 127I, and is a mononuclidic element for atomic weight. Radioisotopes of iodine are known from 108I to 147I. The longest-lived of those, 129I, has a half-life of 16.14 million years, which is too short for it to exist as a primordial nuclide.
Source: Wikipedia "Isotopes of iodine" · CC BY-SA 4.0
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