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astatine    
n. 石厄

石厄

astatine
n 1: a highly unstable radioactive element (the heaviest of the
halogen series); a decay product of uranium and thorium
[synonym: {astatine}, {At}, {atomic number 85}]


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  • Astatine - Wikipedia
    It is the rarest naturally occurring element in the Earth's crust, occurring only as the decay product of various heavier elements All of astatine's isotopes are short-lived; the most stable is astatine-210, with a half-life of 8 1 hours
  • Astatine | Radioactive Halogen, Uses in Medicine Research - Britannica
    astatine (At), radioactive chemical element and the heaviest member of the halogen elements, or Group 17 (VIIa) of the periodic table
  • Astatine Facts - The Rarest Natural Element
    Astatine (At) is a rare and highly radioactive element with atomic number 85 It is part of the halogen group (Group 17) in the periodic table, which also includes fluorine, chlorine, bromine, and iodine Unlike the other halogens, astatine has no stable isotopes
  • Astatine - Element information, properties and uses | Periodic Table
    A mass spectrometer has been used to confirm that astatine behaves chemically like other halogens, particularly iodine Astatine has no known biological role It is toxic due to its radioactivity Astatine can be obtained in a variety of ways, but not in weighable amounts
  • Astatine Element | Uses, Facts, Physical Chemical Characteristics
    Astatine is a shiny dark colored element Astatine is a radioactive element It is a semiconductor and can have metallic properties Astatine undergoes sublimation but less readily than iodine and have a low vapor pressure
  • Astatine (At) Element: Properties, Hazard, Uses - Science Info
    Astatine is a chemical element with an atomic number of 85 and is represented by the symbol ‘At’ in the periodic table Its appearance is unknown classified as metal and belongs to the p-block of group 17 of the periodic table
  • Astatine - New World Encyclopedia
    Astatine (chemical symbol At, atomic number 85) is the rarest naturally occurring chemical element It is a member of the halogen family of elements and is the heaviest halogen Its chemical properties appear to resemble those of iodine
  • Understanding Astatine: The Rarest Halogen Element
    Explore the fascinating world of Astatine, the rarest and most radioactive member of the halogen group Discover its historical background, physical and chemical properties, and its potential uses in medicine and research Learn why this enigmatic element continues to intrigue scientists
  • Astatine | At2 | CID 5460480 - PubChem
    Astatine A radioactive halogen with the atomic symbol At, and atomic number 85 Its isotopes range in mass number from 200 to 219 and all have an extremely short half-life Astatine may be of use in the treatment of hyperthyroidism because it emits ALPHA PARTICLES
  • New Understanding of Astatines Chemical . . . - Texas A M University
    Astatine is one of the least-studied elements of the Periodic Table, because all isotopes of astatine are unstable, with the longest half-life barely exceeding 8 hours





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