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 - 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 | Radioactive Halogen, Uses in Medicine & Research
2024年10月17日 — 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.
Facts About Astatine - Live Science
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 about 70...
Astatine Facts – The Rarest Natural Element - Science Notes and …
2024年10月16日 — 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 | Uses, Facts, Physical & Chemical Characteristics
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.
Astatine Facts (Element 85 or At) - ThoughtCo
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. The …
Properties of astatine | Britannica
astatine, Radioactive chemical element and the heaviest halogen element, chemical symbol At, atomic number 85. It was first synthetically produced in 1940 from the bombardment of bismuth by alpha particles and neutrons.
Astatine (At) - Periodic Table
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.
WebElements Periodic Table » Astatine » the essentials
Name: astatine. Symbol: At. Atomic number: 85. Relative atomic mass (Ar): [ 210 ] (longest lived isotope) Standard state: solid at 298 K. Appearance: metallic. Classification: Semi-metallic. Group in periodic table: 17. Group name: Halogen.