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{{Element | name=Iodine | symbol=I | anumber=53 | amass=126.90447 amu | state=Solid | class=Halogen | cstructure=Orthorhombic | density=4.93 g/cm^3 | color=Extremely dark purple | stableisotopes=1 | date=1811 | discname=Barnard Courtois | origname=Greek 'iodes', violet | uses=Pharmaceuticals, food supplements, dyes, catalysts. | obtained=Brine, seaweed. }}

{{Element | name=Iodine | symbol=I | anumber=53 | amass=126.90447 amu | state=Solid | class=Halogen | cstructure=Orthorhombic | density=4.93 g/cm^3 | color=Extremely dark purple | stableisotopes=1 | date=1811 | discname=Barnard Courtois | origname=Greek 'iodes', violet | uses=Pharmaceuticals, food supplements, dyes, catalysts. | obtained=Brine, seaweed. }}

'''Iodine''' (pronounced to rhyme with "mean") is a [[chemical element]].  A trace element, it is required by humans for the synthesis of the [[thyroid]] [[hormone]] thyroxin. <ref>http://lpi.oregonstate.edu/infocenter/minerals/iodine/</ref>  People who do not get enough iodine in their diet can suffer from goiter, a disease of the thyroid.  This is rarely a problem; but to make sure, iodine is often added to salt ("iodized salt".)

'''Iodine''' (Pronounced '''eye'''-o-dyne or '''eye'''-o-dean) is a [[chemical element]].  A trace element, it is required by humans for the synthesis of the [[thyroid]] [[hormone]] thyroxin. <ref>http://lpi.oregonstate.edu/infocenter/minerals/iodine/</ref>  People who do not get enough iodine in their diet can suffer from goiter, a disease of the thyroid.  This is rarely a problem; but to make sure, iodine is often added to salt ("iodized salt".)

Iodine is a solid which '''sublimes''' at room temperature&mdash;it slowly evaporates directly into the gaseous vapor phase, without going through a liquid phase.

Iodine is a solid which '''sublimes''' at room temperature&mdash;it slowly evaporates directly into the gaseous vapor phase, without going through a liquid phase.

It was discovered by accident in 1811, while Barnard Courtois was treating seaweed ash (which contains a significant amount of iodine) with sulfuric acid.

It was discovered by accident in 1811, while Barnard Courtois was treating seaweed ash (which contains a significant amount of iodine) with sulfuric acid.

For a long time a substance called "iodine" (often pronounced to rhyme with "mine") has been used as a household treatment/disinfectant for cuts and scrapes.  That is actually '''tincture of iodine''', a dilute solution of potassium iodide in alcohol.

For a long time a substance called "iodine" has been used as a household treatment/disinfectant for cuts and scrapes.  That is actually '''tincture of iodine''', a dilute solution of potassium iodide in alcohol.

==References==

==References==