|Atomic mass||126.90447 amu|
|Number of Stable Isotopes||1|
|Density (grams per cc)||4.93 g/cm^3|
|Date of discovery||1811|
|Name of discoverer||Barnard Courtois|
|Name origin||Greek 'iodes', violet|
|Uses||Pharmaceuticals, food supplements, dyes, catalysts.|
|Obtained from||Brine, seaweed.|
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. 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" 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.
|Periodic Table of the Elements|