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__**IODINE**__ __HISTORY OF IODINE __  Iodine was discovered by Courtois in 1811, he wanted to find a way to make large quantities of sodium carbonate without using wood ashes because it was limited. Bernard obtained sodium carbonate by burning seaweed, while washing seaweed pans with hot concentrated sulfuric acid, a cloud of purple vapor appeared. He noticed that the vapor crystallized on cold surfaces to make darker crystals, Bernard suspected that the crystals a new element but he couldn’t do extensive research because of the war. So he gave the samples to his friends, Charles Bernard Desormes and Nicolas Clément to continue the research. __CHARACTERISTICS __ Iodine is a chemical element with the symbol I and atomic number 53 and is found on Earth. It is usually a diatomic molecule I2 and is a halogen; Iodine is a bluish-black, glossy solid. Although it is the least reactive than the other elements in its group 17(fluorine, chlorine and bromine) it still forms compounds with other elements. Even though iodine is a non-metal, it also displays some metallic properties.  __CHEMICAL PROPERTIES __ 53 126.9045 g.mol -1 2.5 114 °C 184 °C 15 **__Classification__** Halogen
 * __ Atomic number __**
 * __ Atomic mass __**
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0.216 nm (-1); 0.05 nm (+7) 
 * __ Ionic radius __**

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__USES __ Iodine is important in medicine; it is used in both radioactive and non-radioactive forms. A solution containing potassium iodide and iodine in alcohol is used to disinfect external wounds. Silver iodide is the major ingredient to traditional photography. Iodine is sometimes added to table salt to prevent thyroid disease. Iodine’s other uses also include catalysts, animal feeds and printing inks and dyes.  __HEALTH ISSUE: __ __IODINE DEFICIENCY __ In areas where marine life isn't eaten, iodine deficiency increases the risk of hypothyroidism, mental slowing, depression, weight gain and low body temperatures. Iodine deficiency is the leading cause of preventable mental retardation, a result that occurs when babies or small children experience hypothyroidism by a lack of Iodine. Some health effects related to iodine deficiency include Breast Cancer because iodine is in breast milk and without iodine the breast may develop a hyperplasia. Also stomach cancer is affected by iodine deficiency because iodine-prophylaxis helps decrease the death rate from stomach cancer.  media type="youtube" key="HWT9lw-9EvM" width="425" height="350" __ENVIRONMENTAL EFFECTS OF IODINE __ <span style="font-family: 'Calibri','sans-serif'; font-size: 18.6667px;">Iodine can affect the environment in many ways; it can combine with water particles in the air and rain into the soil or water. Plants that grow in these soils can absorb iodine and animals that eat these plants or drink the water can also ingest the iodine. People can also release iodine gas into the air by burning coal or fuel oil for energy which is very harmful for the environment. Radioactive iodine formed during uranium and plutonium processing at nuclear power plants is very harmful to the environment because of the large amounts of radioactive releasing into the air. <span style="font-family: 'Calibri','sans-serif'; font-size: 18.6667px;"> __ References: __

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2. [|http://www.chemicool.com/elements/iodine.html#appear]

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