iodine127

Iodine-127, denoted as 127I or I-127, is the only stable isotope of the element iodine. As such, it is the most abundant naturally occurring isotope of iodine, making up 100% of the element's natural isotopic abundance. Its nucleus contains 53 protons and 74 neutrons. Being stable means that iodine-127 does not undergo radioactive decay. This stability is a key characteristic that distinguishes it from other isotopes of iodine, such as iodine-131, which is radioactive and used in medical treatments. Naturally occurring iodine found in the environment, in food sources like seafood and dairy products, and in the human body is predominantly iodine-127. The biological role of iodine, essential for the production of thyroid hormones, is fulfilled by this stable isotope. When discussing iodine in the context of nutrition, thyroid health, or the general chemical behavior of the element, it is typically referring to the properties associated with iodine-127. Its presence is fundamental to the existence of iodine as a distinct element on Earth.