Pure iodine is poisonous if ingested.Įstimated Crustal Abundance: 4. The periodic table is a chart that shows how chemical elements are related to each other. The halogens are in Group 17 (VIIA) of the periodic table. It can burn the skin and damage the eyes and mucous membranes. Iodine is the heaviest of the commonly occurring halogens. A radioactive isotope of iodine, iodine-131, is used to treat some diseases of the thyroid gland.Ĭare should be taken in handling and using iodine. It is used in antiseptics, germicides (products that kill germs), and other medical. Potassium iodide (KI) is used to make photographic film and, when mixed with iodine in alcohol, as an antiseptic for external wounds. Its single most important property may be the ability to kill germs. Iodine is used as a test for starch and turns a deep blue when it comes in contact with it. Iodine is added to salt (iodized salt) to prevent these diseases. A lack of iodine can also cause a goiter, a swelling of the thyroid gland. Iodine is part of thyroxin, a hormone produced by the thyroid gland that controls the body's rate of physical and mental development. Trace amounts of iodine are required by the human body. Today, iodine is chiefly obtained from deposits of sodium iodate (NaIO 3) and sodium periodate (NaIO 4) in Chile and Bolivia. The gas condensed on metal objects in the room, creating solid iodine. He accidentally added too much acid and a violet colored cloud erupted from the mass. Once these compounds were removed, he added sulfuric acid (H 2SO 4) to further process the ash. This vial contains 10 grams of resublimated iodine plus 3.5 grams of potassium iodide, and the label says its from the 'main veterinary place' in Berlin. Courtois was extracting sodium and potassium compounds from seaweed ash. Iodine is used as a disinfectant, or at least used to be. The maximum allowable concentration of iodine in air should not exceed 1 mg/m 3 (8-hour time-weighted average - 40-hour).Iodine was discovered by the French chemist Barnard Courtois in 1811. HandlingĬare should be taken in handling and using iodine, as contact with the skin can cause lesions iodine vapor is intensely irritating to the eyes and mucus membranes. The deep blue color with starch solution is characteristic of the free element. Potassium iodide finds use in photography. Iodides, and thyroxine which contains iodine, are used internally in medicine, and as a solution of KI and iodine in alcohol is used for external wounds. Iodine compounds are important in organic chemistry and very useful in medicine. The most common compounds are the iodides of sodium and potassium (KI) and the iodates (KIO 3). The artificial radioisotope 131I, with a half-life of 8 days, has been used in treating the thyroid gland. /rebates/&252findustrial-uses. This gland helps to regulate growth and body temperature. Our bodies contain up to 20 milligrams, mainly in the thyroid gland. Biological role Iodine is an essential element for humans, who need a daily intake of about 0.1 milligrams of iodide. ![]() Only one stable isotope, 127I is found in nature. The radioactive isotope iodine-131 is sometimes used to treat cancerous thyroid glands. It dissolves readily in chloroform, carbon tetrachloride, or carbon disulfide to form beautiful purple solutions. Iodine exhibits some metallic-like properties. Iodine is also used, in small amounts, as a. Iodine is a bluish-black, lustrous solid, volatizing at ordinary temperatures into a blue-violet gas with an irritating odor it forms compounds with many elements, but is less active than the other halogens, which displace it from iodides. What are 3 uses of Iodine element Iodine is used in medicine as a sterilizing agent, and to help remove harmful levels of radiation from a patient. Several other methods of isolating the element are known. ![]() ![]() Ultrapure iodine can be obtained from the reaction of potassium iodide with copper sulfate. The name is from Greek ioeids, meaning violet or purple, due to the color of iodine. Discovered by Courtois in 1811, Iodine, a halogen, occurs sparingly in the form of iodides in sea water from which it is assimilated by seaweeds, Chilean saltpeter, nitrate-bearing earth (known as caliche), brines from old sea deposits, and in brackish waters from oil and salt wells. Iodine is a chemical element with symbol I and atomic number 53. Kelp is the main source of natural iodineħ, 6, 5, 4, 3, 1, −1 (a strongly acidic oxide)įrom the Greek word iodes, violet.
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