![]() Many believe that under these conditions, solid iodine will sublimate into gas. For iodine, the triple point is 113.5˚C at 12.1 kPa. This is an endothermic transition and only occurs when the temperature and pressure are below the triple zero. When a solid sublimates, it directly transforms into vapor, completely skipping the liquid phase. What is sublimation? Usually, when a solid vaporizes, it first has to melt into a liquid. Iodine sublimates: Fact or fiction? Iodine in several different states showing its purple color Furthermore, thyroxine, a secretion of the thyroid gland in humans, contains iodine. In addition to the Earth’s crust, this element is in seawater. Out of the halogen family, iodine is the least abundant. KI acts to decrease the vapor pressure and to dilute iodine to make it safer. More specifically, this element reacts well with solutions containing potassium iodide (KI I 2 → KI 3). However, it reacts oppositely towards aqueous solutions of iodide, where it is very soluble. Out of the halogen family, iodine is the least soluble in water, with a solubility value of 0.03 grams per 100 grams of water. Still, it has the greatest reducing strength and readily gains electrons from other atoms. However, compared to its family members, iodine is relatively less reactive. All halogens are highly electronegative and very reactive. The element iodine belongs to the halogen family, along with fluorine, chlorine, bromine, and astatine. The iodine atom has an electron configuration of 4d 105s 25p 5, or 1s 22s 22p 63s 23p 63d 104s 24p 64d 105s 25p 5 Iodine vs Other Halogens Its aqueous chemistry is similar to bromine’s. The element iodine lies below bromine, above astatine, to the right of tellurium, and to the left of xenon. ![]() Iodine, with atomic symbol I, is a nonmetal that lies in group 17 of the periodic table, the halogens.
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