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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 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 | 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
    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
  • What Is Astatine Used For? Its Role in Cancer Therapy
    Astatine (At) is a highly radioactive element that stands out due to its extreme scarcity and instability This unique combination of properties means it has virtually no common industrial applications, focusing its utility almost exclusively on specialized medical treatment
  • 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
  • How Rare Is Astatine? Rarity, Occurrence, Production, and Uses
    Astatine is widely regarded as the rarest naturally occurring element in Earth's crust Best estimates place the total amount present at any moment between less than 1 gram and roughly 28 grams Every isotope decays quickly - the longest lived is At-210 at about 8 1 hours - so astatine must be made on demand in accelerators for research and
  • Astatine Element: Properties, Uses, and Where to Find It
    Astatine (**At**) is the heaviest and least stable member of the halogen family, positioned below iodine in Group 17 of the periodic table Its atomic number is **85**, and it’s a synthetic element, meaning it doesn’t occur naturally in significant quantities—only in trace amounts in uranium ores
  • Astaxanthin: 19 Known Medical Benefits, Uses, Side Effects Conditions
    Astaxanthin has proved helpful in the treatment of some diseases such as Alzheimer’s, Parkinson’s, stroke, high cholesterol and other conditions Learn more about its usage, effectiveness and benefits
  • 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





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