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Line 1: − '''Iodine''' is a [[chemical element]]. A trace element, it is required by humans for the synthesis of [[thyroid]] [[hormones]]. <ref>http://lpi.oregonstate.edu/infocenter/minerals/iodine/</ref>+ − Its [[atomic number]] is 53.+ + + + + + +
That just about finishes "I". (Iron already has a decent page.)
{{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 is a solid which '''sublimes''' at room temperature—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.
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.
==References==
==References==