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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
    Astatine is a chemical element; it has symbol At and atomic number 85 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 Consequently, a solid sample of the element has never been seen, because any
  • Astatine Facts - The Rarest Natural Element
    Get astatine facts Discover the history, properties, sources, and uses of atomic number 85, the rarest natural element
  • 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 - Element information, properties and uses | Periodic Table
    Element Astatine (At), Group 17, Atomic Number 85, p-block, Mass [210] Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images
  • Astatine compounds - Wikipedia
    Astatine compounds are compounds that contain the element astatine (At) As this element is very radioactive, few compounds have been studied Less reactive than iodine, astatine is the least reactive of the halogens [1] Its compounds have been synthesized in nano-scale amounts and studied as intensively as possible before their radioactive disintegration The reactions involved have been
  • 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
  • 40 Facts About Astatine
    Discover 40 fascinating facts about astatine, the rarest naturally occurring element on Earth, and uncover its unique properties and uses
  • Facts About Astatine - Live Science
    Astatine is the rarest element on Earth; only approximately 25 grams occur naturally on the planet at any given time Its existence was predicted in the 1800s, but was finally discovered about 70
  • Meet The Rarest Natural Element on Earth - ScienceAlert
    According to the guys at From Quarks to Quasars, who made the awesome infographic above, astatine is the rarest naturally occurring element that isn't a transuranic element These strange elements are all the ones on the periodic table that have an atomic number greater than that of uranium - 92 - and they're super-unstable, decaying into a bunch of other elements
  • What Is Astatine Used For? - Encyclopedia Britannica
    Astatine has no established industrial, commercial, or household applications, because of its extreme scarcity and short half-lives However, the isotope astatine-211 is being researched for possible use in cancer treatment





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