![]() The unknown substance was called Eka-iodine before its discovery in 1931 at the Alabama Polytechnic Institute (Auburn University). Scientists tried finding the element that followed iodine in the halogen group of the periodic table for a long time. –Īstatine comes from the Greek word astatos, meaning “unstable”. At is far less reactive than iodine, and is the least reactive of all the halogens. Astatine reacts with other elements such as sodium and hydrogen (forms hydrogen astatide). Its most stable isotope has a half-life of 8.3 hours. Researchers at the Brookhaven National Laboratory have performed experiments measuring reactions involving astatine however, this research is very limited as astatine is extremely rare (which is a consequence of its extremely short half-life). Astatine is thought to be more metallic than iodine. It is believed that this highly radioactive element might accumulate in the thyroid gland like iodine. Astatine is currently Earth’s rarest element (only one ounce is contained within the entire planet’s crust).Īstatine has been confirmed to behave chemically similar to that of other halogens, including iodine. Trace amounts are also found in natural minerals. Although At is produced by radioactive decay in nature, it is typically found only in miniscule amounts due to its short half-life (the time it takes for one half of the atoms of a given radioactive substance to decay or disintegrate). Corson, Kenneth Ross Mackenzie, and Emilio Segrè in 1940. The symbol for Astatine is At and its atomic number is 85. Oelen ( )).Is a radioactive chemical element. The most stable isotope of astatine is 210 which has a half-life of 8.1 hours. Astatine 211 is the product and has a half-life of 7.2 hours. The element can be produced by bombarding targets made of bismuth-209 with high energy alpha particles (helium nuclei). It is radioactive and its name, from the Greek astatos, means "unstable". ![]()
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