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Iodine Compounds
   Ammonium iodide
   Iodic acid
   Lead(II) iodide
   Lithium iodide
   Nitrogen triiodide
   Potassium iodide
   Sodium iodide
   Thyroxine (T4)
   Triiodothyronine (T3)
Ammonium iodide NH4I
It is used in photographic chemicals and some medications.
Iodic acid HIO3
Iodic acid is used as a standard strong acid in analytical chemistry. It may be used to standardize solutions of both weak and strong bases, with methyl red or methyl orange as the indicator.
Lead(II) iodide PbI2
: Toxic :
As toxic, yellowish solid. In its crystalline form it is used as a detector material for high energy photons including x-rays and gamma rays.
Lithium iodide LiI
Lithium iodide is used as an electrolyte for high temperature batteries. It is also used for long life batteries as required, for example, by cardiac pacemakers. The solid is used as a phosphor for neutron detection.
Nitrogen triiodide NI3
Also called nitrogen iodide, is a highly explosive compound of nitrogen and iodine. It is a contact explosive, and small quantities explode with a gunpowder-like snap when touched by even a feather, releasing a volatile cloud of iodine vapour.
Small amounts of nitrogen triiodide are sometimes synthesized as a demonstration to chemistry students. However, because the compound is so unstable, it has not been used in blasting caps or primers for explosives.
The reason for it's instability is due to the size difference between the two different types of atoms. The three iodine atoms are much bigger than the nitrogen atom holding them together. Because of this, not only is the bond between nuclei under much stress and therefore weaker, but the outside electrons of the different iodine atoms are very close, which increases the overall instability of the molecule.
Potassium iodide KI
Potassium iodide is used in photography, in the preparation of silver(I) iodide for high speed photographic film.
Potassium iodide may also be used to protect the thyroid from radioactive iodide in the event of an accident or terrorist attack at a nuclear power plant, or other nuclear attack, especially where a nuclear reactor is breached and the volatile radionuclides, which contain significant amount of 131I, are released into the environment. Radioiodine is a particularly dangerous radionuclide because the body concentrates it in the thyroid gland.
Sodium iodide NaI
Sodium iodide is commonly used to treat and prevent iodine deficiency. Solid crystals can be used to detect radiation (e.g. radiation from uranium) - a solid crystal of sodium iodide creates a pulse of light when radiation interacts with it.
Thyroxine (T4) 3,5,3',5'-tetra-iodothyronine
An important hormone produced by the thyroid gland.
The thyroid hormones are essential to proper development and differentiation of all cells of the human body. These hormones also regulate protein, fat, and carbohydrate metabolism, affecting how human cells use energetic compounds. Numerous physiological and pathological stimuli influence thyroid hormone synthesis.
Hypothyroidism is a disorder where there is a deficiency of thyroxine. Thyrotoxicosis or hyperthyroidism is the clinical syndrome caused by an excess of circulating free thyroxine, free triiodothyronine, or both.
Triiodothyronine (T3) 
An important hormone produced by the thyroid gland.
The thyroid hormones are essential to proper development and differentiation of all cells of the human body. These hormones also regulate protein, fat, and carbohydrate metabolism, affecting how human cells use energetic compounds. Numerous physiological and pathological stimuli influence thyroid hormone synthesis.
Hypothyroidism is a disorder where there is a deficiency of thyroxine. Thyrotoxicosis or hyperthyroidism is the clinical syndrome caused by an excess of circulating free thyroxine, free triiodothyronine, or both.