![]() ![]() It’s probably, then, because we feel we should know them better by now that these elements seem so perplexing. The first of these was found by Marie Curie’s protégée Marguerite Perey, who was the first woman to be elected – shockingly, as recently as 1962 – to the French Académie des Sciences. Francium and astatine, though, found their place at the bottom of their respective groups (until tennessine’s introduction to group 17 in 2010, that is) around 80 years ago: francium was discovered in 1939, astatine in 1940. But somehow superheavies like seaborgium and nihonium have come to seem almost familiar, for all that they have only ever existed as a handful of fleeting atoms: their ghostliness has always been a given. There are more elusive elements than these, of course. It is believed that astatine is dark, close to black in appearance based on the other halogen family members color patterns.Of all the elements in the periodic table, two have always struck me as alluringly mysterious: francium and astatine. Most of the properties of astatine are still not known, like its color. Up to only 25 grams of astatine, which is naturally existing can be found at a point of time on earth.īeing highly radioactive yet nearly does not possess any health or environmental effects due to its very sort half-lives and rarity of presence. Astatine is accumulated in the thyroid gland and liver in the similar way iodine is accumulated, but astatine does not emit electrons with high energy like iodine.Īstatine have 32 isotopes, all astatine isotopes are radioactive, means all breakdowns easily and get transformed into other elements. ![]() Astatine 211 is used for cancer treatment and as a radiotherapy only sometimes. Īstatine has an important role in nuclear medicine. In benzene, astatine can replace atom of hydrogen, forming astatobenzene (C 6 H 5 At), and then this can be oxidized by chlorine to C 6 H 5 AtCl 2. Most of the isotopes of astatine are very unstable with one second or less half-lives.Īstatine is known to bind with boron, carbon and nitrogen. It has covalent radius of 150pm and Van der Waals radius of 202pm.Īstatine can react with hydrogen forming hydrogen astatide, which then forms hydroastatic acid when dissolved in water.Īstatine forms complexes with a metal chelating agent, EDTA. Mass number of astatine is 210, which is the most stable isotope of astatine. Melting point: 302 degree Celsius, boiling point: 337 degree Celsius.Īstatine is highly toxic because of its high radioactivity.Įlectronegativity according to Pauling: 2.2, its phase at STP is solid. Therefore very less properties are known till date for astatine. Astatine was discovered in 1940 by scientists Dale Corson, Kenneth McKenzie and Emilio Segre.Īstatine breaks down very soon, thus not allowing much experimentation. Even after decades of discovery, research only little has been known about astatine. ![]() It is one among the rarest naturally found on the earth. It is the member of block p and period 6 of the periodic table and it belongs to halogens family. Astatine is named after a Greek word astatos, meaning unstable. Astatine is a chemical compound with symbol At and atomic number 85, which is a radioactive element. ![]()
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