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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 | Symbol, Atomic Number, Uses, Properties, Facts . . .
    Astatine is a radioactive chemical element and the heaviest member of the halogen elements, or Group 17 (VIIa) of the periodic table Because astatine has no stable or long-lived isotopes, it was given its name from the Greek word astatos, meaning “unstable ”
  • 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 . . .
    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 Properties and Uses - samaterials. com
    Astatine (At) is a rare, highly radioactive halogen with a short half-life It is the least abundant natural element and is primarily used in medical research, particularly in targeted cancer therapies
  • Astatine | At (Element) - PubChem
    Periodic Table Astatine Astatine is a chemical element with symbol At and atomic number 85 Classified as a halogen, Astatine is a solid at 25°C (room temperature)
  • Astatine Element Facts - chemicool. com
    Astatine is highly radioactive and is only available in tiny quantities Its properties are inferred from its position in the periodic table and by studying its chemistry in extremely dilute solutions Like the other halogens, astatine would be expected to form salts with metals such as sodium
  • What is Astatine? - Earth. com
    Astatine is a radioactive chemical element The symbol for Astatine is At and its atomic number is 85 It is the heaviest halogen discovered
  • Astatine, Chemical Element - uses, elements, metal, number . . .
    Astatine is a member of the halogen family, elements in Group 17 (VIIA) of the periodic table It is one of the rarest elements in the universe Scientists believe that no more than 25 grams exist on the Earth's surface All isotopes of astatine are radioactive and decay into other elements
  • Astatine (At): Properties Uses - StudiousGuy
    Astatine is one of the most mysterious elements of the periodic table To begin with, it is the rarest naturally occurring element on Earth It only exists as a minor spur on an obscure pathway of uranium and thorium decay A pure sample of elemental astatine has not yet been isolated by scientists





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