Astatine - Wikipedia
网页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.
Astatine - Element information, properties and uses | Periodic Table
网页Element Astatine (At), Group 17, Atomic Number 85, p-block, Mass [210]. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
Astatine | Radioactive Halogen, Uses in Medicine & Research
网页Astatine (At), radioactive chemical element and the heaviest member of the halogen elements, or Group 17 (VIIa) of the periodic table. Astatine, which has no stable isotopes, was first synthetically produced (1940) at the University of California by American physicists Dale R. Corson, Kenneth R.
Astatine (At) - Definition, Preparation, Properties, Uses
网页2024年6月28日 · Composition: Consists of a single atom of astatine. Bond Type: As a pure element, astatine can form covalent bonds in its compounds, reflecting its nonmetallic character as a halogen. Molecular Structure: Astatine typically exists as monoatomic in its standard state but can form molecules when combined with other elements, reflecting its ...
Astatine Element | Uses, Facts, Physical & Chemical Characteristics
网页Astatine is the least reactive element among its group, halogens. Chemically, astatine shows metallic properties and forms stable monatomic cations in the presence of water. various compounds of astatine are like compounds of iodine. There are only few compounds of astatine. It reacts with hydrogen to form hydrogen astatide.
Astatine | At (Element) - PubChem
网页Astatine. Astatine is a chemical element with symbol At and atomic number 85. Classified as a halogen, Astatine is a solid at room temperature.
Astatine - NIST Chemistry WebBook
网页Molecular weight: 210. IUPAC Standard InChI: InChI=1S/At. IUPAC Standard InChIKey: RYXHOMYVWAEKHL-UHFFFAOYSA-N. CAS Registry Number: 142364-73-6. Chemical structure: This structure is also available as a 2d Mol file. Permanent link for this species. Use this link for bookmarking this species for future reference. Information on this page: …
Astatine Facts (Element 85 or At) - ThoughtCo
网页2020年1月2日 · Astatine is a radioactive element with symbol At and atomic number 85. It has the distinction of being the rarest natural element found in the Earth's crust, as it is only produced from radioactive decay of even heavier elements.
Astatine, Chemical Element - uses, elements, metal, number, …
网页Overview. 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) - Periodic Table
网页Astatine is the 85th element in the periodic table and has a symbol of At and atomic number of 85. It has an atomic weight of (210) and a mass number of 191. Astatine has eighty-five protons and one hundred six neutrons in its nucleus, and eighty-five electrons in six shells.
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