Chemicals and Drugs
Astatine
IsotopeAstatosIsotopes of astat1940FranciumDecayRadioactivityStableGreekNeutronsRadioactive elementAtomsIodineActiniumUraniumShort-livedScarcityPeriodicEarth's crustSecond rarestChemistryRadonElementSymbolRarityMetallicVolatileAlkaliReactionsChlorineBismuthHalf-lifeNaturallyReactiveCompoundsExperimentsElementsPinchVaporizeInterpretationRadiationPropertiesHighlyMetalSampleMeansAlphaStructureElectronicNatureMember
Isotope11
  • Bombardment of the bismuth isotope 209 83 Bi with α-particles (helium nuclei, 4 2 He) results in formation of shortlived astatine and neutrons. (webelements.com)
  • It's so unstable that its most stable isotope, Astatine-210, has a half-life of only 8.1 hours. (xcel.com)
  • Probably it's a matter of their proton and neutron configuration that for some reason are particularly unstable compared to their neighbourhood, but there is still no equation capable of giving the half-life of an isotope. (stackexchange.com)
  • The atomic number of astatine is 85, and the atomic weight of the longest-lived isotope is 210. (8sa.net)
  • It is unlikely that any isotope of astatine with a longer half-life will ever be discovered. (8sa.net)
  • Astatine has no stable isotopes, and its most stable isotope, astatine-210, has a half-life of only about 8.1 hours. (8sa.net)
  • Francium is one of the most unstable of the naturally occurring elements: its longest-lived isotope, francium-223, has a half-life of only 22 minutes. (wikizero.com)
  • The only comparable element is astatine , whose most stable natural isotope, astatine-219 (the alpha daughter of francium-223), has a half-life of 56 seconds, although synthetic astatine-210 is much longer-lived with a half-life of 8.1 hours. (wikizero.com)
  • It turns out this isotope is unstable. (nukejobs.com)
  • It was formerly known as eka-caesium and actinium K.Actually the least unstable isotope, francium-223 It has the lowest electronegativity of all known elements, and is the second rarest naturally occurring element. (absoluteastronomy.com)
  • However, there are trace amounts of the unstable (radioactive) isotope 36 Cl, which is naturally produced in the atmosphere. (wanttoknowit.com)
Astatos2
  • The name " astatine " was taken from the Greek word astatos, meaning "unstable. (8sa.net)
  • Its 30 isotopes are ra dioactive, it was named after the Greek astatos, meaning unstable. (doclecture.net)
Isotopes of astat3
  • Four isotopes of astatine were subsequently found to be naturally occurring, although much less than one gram is present at any given time in the Earth's crust. (wikipedia.org)
  • All 31 of the isotopes of Astatine are unstable. (blogspot.com)
  • Other isotopes of astatine have been synthesized by nuclear transmutation reactions, and some information is available on more than 20 isotopes. (8sa.net)
19404
  • The first synthesis of astatine was in 1940 by Dale R. Corson, Kenneth Ross MacKenzie, and Emilio G. Segrè at the University of California, Berkeley. (wikipedia.org)
  • Astatine was discovered by Dale Corson, MacKenzie, Segre in 1940 at California, USA. (webelements.com)
  • Astatine was first produced by Dale R. Corson, Kenneth R. MacKenzie, and Emilio Segre in 1940. (8sa.net)
  • Astatine is an artificial ele ment, first prepared at the University of California by Emilio Segre and others in 1940. (doclecture.net)
Francium7
  • Of the first 101 elements in the periodic table, only francium is less stable, and all the astatine isotopes more stable than the longest-lived francium isotopes are in any case synthetic and do not occur in nature. (wikipedia.org)
  • Actinium, francium, protactinium are also very unstable compared to their neighbours. (stackexchange.com)
  • [7] All isotopes of francium decay into astatine, radium , or radon . (wikizero.com)
  • The problem is that astatine, francium, actinium, and protactinium are absolutely impossible to collect in any meaningful sense of the word. (theodoregray.com)
  • But astatine, francium, actinium, and protactinium are in a whole other league of non-collectability. (theodoregray.com)
  • My Revigator, which contains quite a bit of carnotite uranium ore, probably has more astatine, francium, actinium, and protactinium in it than my depleted uranium metal samples, even though they have far more uranium in them. (theodoregray.com)
  • This mineral, Thorite , appears in my Photographic Periodic Table Poster representing francium, because this highly unstable element can't reasonably be photographed. (theodoregray.com)
Decay6
  • The rock probably contains on the order of a few atoms of astatine at any one time, as part of the complex decay chain of the uranium that makes up a much larger fraction of the sample. (theodoregray.com)
  • Astatine is produced by the decay of heavier elements, and at any given moment, it's estimated that there is less than an ounce (around 28 grams) of Astatine in the Earth's crust. (xcel.com)
  • This means that any sample of astatine would decay rapidly, making it very difficult to handle or even to study. (8sa.net)
  • Francium's isotopes decay quickly into astatine, radium , and radon . (wikizero.com)
  • Most of the unstable isotopes below 35 Cl decay to silicon and most of the unstable isotopes above 37 Cl decay to Argon. (wanttoknowit.com)
  • In chemistry, Indium Radioisotopes are unstable isotopes of Indium (In) that decay or disintegrate emitting radiation. (wellnessadvantage.com)
Radioactivity3
  • A visible piece of astatine would immediately vaporize itself because of the heat generated by its intense radioactivity. (wikipedia.org)
  • Because of its extreme rarity and radioactivity, Astatine has no commercial applications and is of interest only for research purposes. (xcel.com)
  • In fact, no pure sample of astatine has ever been collected because any specimen would vaporize due to the heat generated by its own radioactivity. (thechemistrynotes.com)
Stable3
  • the most stable is astatine-210, with a half-life of 8.1 hours. (wikipedia.org)
  • A similar question could be asked about technetium: why is it unstable, even though it stands in the periodic table between stable elements? (stackexchange.com)
  • that is, astatine has no stable isotopes. (8sa.net)
Greek1
  • After a reminder to do so, in a 1947 Nature article, they named the element "Astatine", which means unstable in Greek. (blogspot.com)
Neutrons2
  • Astatine has eighty-five protons and one hundred six neutrons in its nucleus, and eighty-five electrons in six shells. (chemicalaid.com)
  • Using the logic from the linked question, couldn't we just shove less neutrons into the nucleus to make it less unstable? (stackexchange.com)
Radioactive element2
  • The rarest element on Earth is Astatine, a radioactive element with the atomic number 85 on the periodic table. (xcel.com)
  • Astatine (At) is a highly radioactive element and one of the rarest naturally occurring elements on Earth, with a half-life of only a few hours. (8sa.net)
Atoms1
  • Astatine atoms have 85 electrons and the shell structure is 2.8.18.32.18.7. (webelements.com)
Iodine9
  • Chemically, several anionic species of astatine are known and most of its compounds resemble those of iodine, but it also sometimes displays metallic characteristics and shows some similarities to silver. (wikipedia.org)
  • Astatine sublimes less readily than does iodine, having a lower vapor pressure. (wikipedia.org)
  • As an analog of iodine it may have an orthorhombic crystalline structure composed of diatomic astatine molecules, and be a semiconductor (with a band gap of 0.7 eV). (wikipedia.org)
  • Astatine is a halogen and possibly accumulates in the thyroid like iodine. (webelements.com)
  • Astatine exhibits several oxidation states that more or less closely resemble the known states of iodine. (8sa.net)
  • Astatine has oxidation states with coprecipita-tion characteristics that are similar to those of iodide ion, iodate ion, and free iodine. (8sa.net)
  • Astatine has some physiological importance because it is readily taken up by the thyroid gland, as is iodine. (8sa.net)
  • Group 17 of the periodic table consists of fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). (thechemistrynotes.com)
  • Despite being radioactive and having only short-lived isotopes, astatine behaves similarly to iodine and is commonly classified as a halogen. (thechemistrynotes.com)
Actinium1
  • Some other synonyms for astatine include actinide F, nettunium K, actinium K, and actinide E. Moreover, astatine is often referred to as a rare-earth metal, which means that it is a naturally occurring element that is found in very small amounts on earth. (thesaurus.net)
Uranium1
  • Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. (viking.nu)
Short-lived1
  • begingroup$ That is useful, but doesn't actually answer why astatine is so short lived compared to its neighbors, as like I have mentioned: Astatine has a longest half life of around 8 hours. (stackexchange.com)
Scarcity2
  • Despite its scarcity, astatine has numerous applications in medical research, nuclear chemistry, and other industries. (thesaurus.net)
  • However, due to its scarcity and highly radioactive nature, astatine is not produced or used on a large scale. (8sa.net)
Periodic2
  • This mineral, Autunite , appears in my Photographic Periodic Table Poster representing astatine, because this highly unstable element can't reasonably be photographed. (theodoregray.com)
  • Astatine is the 85th element in the periodic table and has a symbol of At and atomic number of 85. (chemicalaid.com)
Earth's crust2
Second rarest2
  • It is the second-most electropositive element, behind only caesium , and is the second rarest naturally occurring element (after astatine ). (wikizero.com)
  • It is very unstable alkali metal and considered the second rarest element in the earth crust. (dentclass.com.br)
Chemistry1
Radon1
  • all its isotopes have half-lives of 8.1 hours or less, decaying into other astatine isotopes, bismuth, polonium, or radon. (wikipedia.org)
Element6
  • Astatine is a chemical element with the symbol At and atomic number 85. (wikipedia.org)
  • In no meaningful way is astatine itself visible in the sample, but sadly that's about the best you can do with an element like this. (theodoregray.com)
  • Information About Astatine Element and Properties, What is astatine used for? (8sa.net)
  • What are the properties, symbol and uses of astatine element? (8sa.net)
  • Information on astatine element. (8sa.net)
  • A team of researchers using the ISOLDE nuclear-physics facility at CERN has measured for the first time the so-called electron affinity of the chemical element astatine , the rarest naturally occurring element on Earth. (moviecultists.com)
Symbol1
Rarity1
  • Due to its rarity and highly radioactive nature, astatine has limited practical applications. (8sa.net)
Metallic3
  • However, astatine also falls roughly along the dividing line between metals and nonmetals, and some metallic behavior has also been observed and predicted for it. (wikipedia.org)
  • Astatine is sometimes described as probably being a black solid (assuming it follows this trend), or as having a metallic appearance (if it is a metalloid or a metal). (wikipedia.org)
  • Metallic astatine is expected to have a density of 8.91-8.95 g/cm3. (wikipedia.org)
Volatile2
Alkali1
  • Astatine is a member of the alkali metals and stainless steels and is slightly soluble in water. (thesaurus.net)
Reactions1
  • Astatine has also been used in studies of chemical reactions and as a tracer in biomedical research. (8sa.net)
Chlorine1
  • Aside from these 3 isotopes, there are 21 other unstable isotopes of chlorine. (wanttoknowit.com)
Bismuth1
  • Heating the bismuth target to 300-600°C under N 2 results in a stream of the elemental astatine that can be collected on a cold glass finger. (webelements.com)
Half-life3
  • I know that atomic nuclei can be stabler if they are spherical, implying that if you make a nucleus that isn't spherical you could destabilize it, but astatine has a maximum half life of 8 hours. (stackexchange.com)
  • Similarly, astatine is unstable, with a maximum half-life of slightly more than eight hours. (thechemistrynotes.com)
  • All of these unstable isotopes have a half life of less than 1 hour and most have a half life of less than a second. (wanttoknowit.com)
Naturally1
  • It is extremely unlikely that anyone could touch astatine, as it is one of the rarest naturally occurring elements on Earth and is highly radioactive. (8sa.net)
Reactive1
  • The longer people spend at a particular career stage (i.e. advancing down a group), the higher their atomic number - which tends to mean they're more reactive and unstable. (febs.org)
Compounds1
  • Binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and other compounds of astatine where known. (webelements.com)
Experiments1
  • However, experiments with astatine are performed in extremely dilute solutions. (8sa.net)
Elements1
  • Unstable elements with atomic numbers greater than 83 that exist in nature solely as radioisotopes. (uchicago.edu)
Pinch2
  • If Steam opens but won't get past nan relationship screen, aliases if it won't load astatine all, location mightiness beryllium an rumor pinch Steam's servers. (tonbusiness.com)
  • In an effort to support their cover, Noky reacts pinch feigned shock, gasping astatine nan news. (paparead.com)
Vaporize1
  • Even so, half of a given quantity of astatine will vaporize in approximately an hour if put on a clean glass surface at room temperature. (wikipedia.org)
Interpretation1
Radiation1
  • If someone were to touch astatine, the main concern would be the risk of radiation exposure. (8sa.net)
Properties3
Highly1
  • Chemical studies of astatine must be made by tracer methods because it is highly radioactive and is obtained only in small quantities. (8sa.net)
Metal1
  • Astatine is likely to have a dark or lustrous appearance and may be a semiconductor or possibly a metal. (wikipedia.org)
Sample1
Means1
Alpha3
  • One potential use of astatine is in targeted alpha-particle therapy for cancer. (8sa.net)
  • Alpha particles emitted by astatine can be used to destroy cancer cells, and research is ongoing to develop ways to use astatine in cancer treatment. (8sa.net)
  • Astatine emits alpha particles, which can be stopped by a sheet of paper or a few centimeters of air, but can be very harmful if they enter the body. (8sa.net)
Structure1
Electronic1
Nature1
  • astatine is radioactive and essentially unavailable in nature. (webelements.com)
Member1
  • Collins remembers that aft the 1975 Tasman Bridge illness forced each postulation done 1 bridge, her parents had to bundle her and her member into the car astatine 6am truthful they could driblet them astatine her grandparents earlier heading to work. (qudach.com)