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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 | Britannica
    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 | 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 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
  • 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
  • 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
  • 8. 13. 7: Chemistry of Astatine (Z=85) - Chemistry LibreTexts
    Astatine is the last of the known halogens and was synthesized in 1940 by Corson and others at the University of California It is radioactive and its name, from the Greek astatos, means "unstable"
  • 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 - an overview | ScienceDirect Topics
    Astatine is defined as the heaviest member of the halogen family, characterized by the absence of stable or long-lived isotopes, necessitating its artificial synthesis through nuclear reactions





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