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  1. Wikipedia
    https://en.wikipedia.org/wiki/Astatine

    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 astat… 展开

    Characteristics

    Astatine is an extremely radioactive element; all its isotopes have half-lives of 8.1 hours or less, d… 展开

    Wikipedia
    Compounds

    Less reactive than iodine, astatine is the least reactive of the halogens; the chemical properties of tennessine, the next-heavier group 17 element, have not yet been investigated, ho… 展开

    Wikipedia
    Meet The Rarest Natural Element on Earth - ScienceAlert
    This instability, combined with its actual scarceness, means that at any one time, there's less than 30 grams of it in the Earth's crust. If scientists need to use it, they have to produce it from scratch, th…
    ScienceAlert · https://www.sciencealert.com/me…
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    目录
    Characteristics
    Compounds
     
  1. 28 grams
    The total amount of astatine in the Earth 's crust has been estimated to be less than one ounce (28 grams) at any given time—corresponding to no more than one teaspoonful in volume.

    Astatine - New World Encyclopedia

    www.newworldencyclopedia.org/entry/Astatine
    www.newworldencyclopedia.org/entry/Astatine
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  2. 其他用户还问了以下问题
    How much astatine is in the Earth's crust?
    This instability, combined with its actual scarceness, means that at any one time, there's less than 30 grams of it in the Earth's crust. If scientists need to use it, they have to produce it from scratch, that said, only 0.05 micrograms (0.00000005 grams) of astatine have been produced to date.

    Meet The Rarest Natural Element on Earth - ScienceAlert

    sciencealert.com
    Why is astatine a rare element?
    The Rarest Natural Element on Earth. This mineral, Autunite, appears in my Photographic Periodic Table Poster representing astatine, because this highly unstable element can't reasonably be photographed. This instability, combined with its actual scarceness, means that at any one time, there's less than 30 grams of it in the Earth's crust.

    Astatine: The Rarest Natural Element on Earth – Geology In

    geologyin.com
    Does astatine exist on Earth?
    Astatine does not exist in significant amounts on Earth. It is primarily produced as a decay product of heavier elements like uranium and thorium. Due to its short half-life (the shortest of any naturally occurring element), any astatine that is formed quickly decays back into other elements. Astatine Properties:

    Astatine: The Rarest Natural Element on Earth – Geology In

    geologyin.com
    How do we know so much about astatine?
    That's how we come to know so much about astatine. Often trumpeted as the rarest naturally occurring element in the world, it's only by extrapolating the properties of the other members of the halogen family, fluorine, chlorine, bromine and iodine the scientists could even begin to look at their obese sibling.

    Astatine - Element information, properties and uses | Periodic Table

    rsc.org
    How much astatine is in nature?
    3. A 1953 estimate by Isaac Asimov put the worldwide total of astatine in nature at 0.07 grams.

    Physicists at CERN measure a fundamental property of the rarest element

    home.cern
    How long does astatine last?
    Named after the Greek word for unstable (astatos), Astatine is a naturally occurring semi-metal that results from the decay of uranium and thorium. In its most stable form - astatine-210 - it's got a half-life of just 8.1 hours, which means even if you did happen to stumble on some of it, half of it would be gone by the end of a work day.

    Meet The Rarest Natural Element on Earth - ScienceAlert

    sciencealert.com
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  3. The Royal Society of Chemistry
    https://www.rsc.org/periodic-table/element/85

    Astatine - Element information, properties and uses | Periodic Table

  4. ScienceAlert
    https://www.sciencealert.com/meet-the-r…

    Meet The Rarest Natural Element on Earth - ScienceAlert

    网页2015年3月5日 · This instability, combined with its actual scarceness, means that at any one time, there's less than 30 grams of it in the Earth's crust. If scientists need to use it, they have to produce it from scratch, that said, …

  5. Geology In
    https://www.geologyin.com/2017/05/mee…

    Astatine: The Rarest Natural Element on Earth – …

    网页It's so rare, there's just 30 grams TOTAL in Earth's crust. The rarest naturally occurring element on Earth is astatine, with an atomic number of 85 and symbol At. Named after the Greek word for unstable (astatos), …

  6. Scientific American
    https://www.scientificamerican.com/article/...

    Physicists Find Way to Measure Earth's Rarest Element

  8. Live Science
    https://www.livescience.com/39514-fac…

    Facts About Astatine - Live Science

    网页2017年5月24日 · 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...

  9. Live Science
    https://www.livescience.com/32064-rar…

    Property of Rarest Element on Earth Measured for 1st …

    网页2013年5月16日 · A fundamental property of the rarest element on Earth, astatine, has been discovered for the first time, scientists say. Astatine occurs naturally; however, scientists estimate much less than...

  10. CERN
    https://home.cern/news/news/physics/is…

    ISOLDE reveals fundamental property of rarest element …

    网页2020年7月30日 · A team of researchers using the ISOLDE nuclear-physics facility at CERN has measured for the first time the so-called electron affinity of the chemical element astatine, the rarest naturally occurring element …

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  11. CERN
    https://home.cern/news/press-release/cern/...

    Physicists at CERN measure a fundamental property of the rarest …

  12. New World Encyclopedia
    https://www.newworldencyclopedia.org/entry/Astatine

    Astatine - New World Encyclopedia

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