5iodinegasira

__**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 found a way to get sodium carbonate by burning seaweed. While washing seaweed pans with hot sulfuric acid, a cloud of purple vapor appeared. He noticed that the vapor crystallized on cold surfaces to make darker crystals, Bernard assumed that the crystals were a new element but he couldn’t do more research because he was too caught up with the war. So he gave the samples to his friends, Charles Bernard Desormes and Nicolas Clément to continue the research.
 * [[image:5iodinegasira/courtois_bernard.jpg width="183" height="234" caption="Bernard Courtois"]] ||
 * [[image:5iodinegasira/Iodine.jpg width="184" height="153" caption="In the gas phase, iodine shows its violet color."]] ||

__CHARACTERISTICS __ Iodine is a chemical element with the symbol I and atomic number 53. 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 can still form compounds with other elements. Iodine is a non-metal but also displays some metallic properties. __CHEMICAL PROPERTIES __ 53 126.9045 g.mol -1 2.5 114 °C 184 °C 15 **__Classification__** Halogen 0.216 nm (-1); 0.05 nm (+7)
 * [[image:5iodinegasira/index.jpg width="220" height="169" caption="Pure iodine crystals, heated slightly, "]] ||
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 * [[image:5iodinegasira/b0053.gif width="178" height="172" caption="Bohr Diagram of Iodine"]]media type="youtube" key="E-fs9OwE9Y0" width="425" height="350" ||

__USES __ Iodine is important in medicine; it is used in both radioactive and non-radioactive forms. A solution with potassium iodide in alcohol is used to disinfect cuts and silver iodide is used in photography. Also, iodine is sometimes added to table salt to prevent thyroid disease. Iodine’s other uses also include catalysts, animal feeds, printing inks and dyes.
 * [[image:5iodinegasira/Liquid_Dyes_250x250.jpg width="205" height="205" caption="Liquid 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 dominant cause of preventable mental delay, as a result babies or small children experience hypothyroidism because of iodine deficiency. A health effect related to iodine deficiency is breast cancer because iodine is in breast milk and without iodine the breast may develop a hyperplasia. media type="youtube" key="HWT9lw-9EvM" width="425" height="350" || __ENVIRONMENTAL EFFECTS OF IODINE __ Iodine can affect the environment in many ways; it can combine with water particles in the air and rain into the soil. 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 are very harmful to the environment because of the large amounts of radioactive iodine releasing into the air.
 * [[image:5iodinegasira/industries-animal_feeds.jpg width="292" height="171" caption="Animal Feeds"]] ||
 * [[image:5iodinegasira/images.jpg caption="Preparing For Radioactive Iodine Treatment "]]
 * [[image:5iodinegasira/caution-radiation.jpg width="206" height="279" caption="Caution Radiation Hazard"]] ||


 * [[image:5iodinegasira/Nuclear-Power-Plant.jpg caption="Accidents in Powerplants release radioactive iodine into the air" link="http://www.youtube.com/watch?v=HWT9lw-9EvM"]] ||

__ References: __

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

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__3 Reviews: 3 things I've learned__ Hodo- Rehabilitating Lakes
 * 1) I learned that granite is a light colored igneous rock with grains large enough to be visible with the unaided eye.
 * 2) Another thing I learned was that energy conservation can eliminate acid rain.
 * 3) I also learned that acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air.

Luula- Iodine
 * 1) I learned that most natural iodine is found in oceans.
 * 2) I also learned that because of iodine's low toxicity it is used for human nutrition.
 * 3) Also, I've learned learned that if you take large quantities of iodine it is very dangerous and toxic.

Nalima- Pulp and Paper
 * 1) I learned that paper is bleached to make it white because pulp is usually brown.
 * 2) Another thing I've learned was that creating paper causes air and water pollution.
 * 3) Also, I learned that it is impossible to reduce waste emissions from pulp and paper productions.