Fluorine is extremely noxious in both gas state or in metal fluoride state. Fluorine is found in the minerals fluorspar (CaF2) and cryolite (Na3AlF6) (McQuarrie, 2007). Fluorine toughens the crystalline structure of bones and teeth, making them far less prone to breakage or decay, hence why it is a main ingredient in toothpaste. Some cities put fluorine salts into the water system to help keep the population safe from tooth decay.
Chlorine is a caustic, green and yellow gas that is attained by the electrolysis of sodium chloride solutions. Chlorine salt is found in salt water such as seas, oceans and salt water lakes and in various minerals. The most common mineral of chlorine is the halite (sodium chloride) (McQuarrie, 2007). Similar to fluorine chlorine salts (halides) are beneficial to the human body. A muriatic acid, hydrochloric acid (HCl), is used in the stomac...
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...ing, and iodine is added to table salt. Like fluorine and chlorine iodine is essential to the human body. Iodine is a plays a key role in the function of thyroid hormones. An iodine deficiency will cause goiter, a thyroid deficiency disease where there is swelling of the neck due to an enlarged thyroid gland. The thyroid gland enlarges in order to produce more iodine. This can be treated with potassium iodide (KI).
Astatine was not featured in the Interchapter but it is considered part of the halogen group. Astatine is a dark colored, metallic solid. Astatine is highly radioactive and is produced synthetically by blasting bismuth (Bi) with alpha particles, it can be obtained naturally from thorium (Th) or uranium (U) decay (David, 2013). The most stable isotope of astatine has a half-life of 8.3 hours. It is too uncommon to have any manufacturing or marketable uses.
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