![]() ![]() ![]() The human body contains iodine in the compound thyroxine, which is produced in the thyroid gland. Sodium iodate (NaIO 3) is contained in crude Chile saltpetre (sodium nitrate, NaNO 3). It is also formed in seaweeds, oysters, and cod livers. It is present in seawater, but sparingly, as the iodide ion, I −, to the extent of approximately 50 mg per metric ton (0.0016 ounce per ton) of seawater. Iodine is never found in nature uncombined, and it is not concentrated sufficiently to form independent minerals. This vapour condensed to a black crystalline substance, which he called “substance X.” In 1813 British chemist Sir Humphry Davy, who was passing through Paris on his way to Italy, recognized substance X as an element analogous to chlorine he suggested the name iodine from the Greek word ioeides, “violet coloured.” Occurrence and distribution Iodine (I) - Discovery, Occurrence, Production, Properties and Applications of Iodine Chemical Formula. In 1811 the French chemist Bernard Courtois obtained a violet vapour by heating seaweed ashes with sulfuric acid as a by-product of the manufacture of saltpetre. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.This Time in History In these videos, find out what happened this month (or any month!) in history.It’s a relatively rare element that’s naturally found in Earth’s crust. #WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find. Iodine (I) is a chemical element with atomic number 53 in the periodic table.Iodine is a very rare element, but it is found in very trace amounts in our surroundings (including soil, plants, water, animals, humans, etc. ![]() Iodine is the 47th abundant element in the solar system.
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