name some of its isotopes
Iodine-129, iodine-127, iodine-123, iodine-125 etc
Iodine
iodine-129
where does naturally source of iodine come from Seafood, such as fish, seaweeds (such as kelp) and shellfish, dairy products and eggs etc what is the atomic number of this element? 53 how does this element look physically at normal temperature conditions? It exists as a lustrous, purple-black non-metallic solid.
wiki:7685908
Iodine [SEP] Isotopes
Of the thirty-seven known isotopes of iodine, only one occurs in nature, iodine-127. The others are radioactive and have half-lives too short to be primordial. As such, iodine is both monoisotopic and mononuclidic and its atomic weight is known to great precision, as it is a constant of nature. The longest-lived of the radioactive isotopes of iodine is iodine-129, which has a half-life of 15.7 million years, decaying via beta decay to stable xenon-129. Some iodine-129 was formed along with iodine-127 before the formation of the Solar System, but it has by now completely decayed away, making it an extinct radionuclide that is nevertheless still useful in dating the history of the early Solar System or very old groundwaters, due to its mobility in the environment.