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 - 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 (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.
Atomic Number of Astatine At
网页Learn the atomic number of Astatine At. Element properties of Astatine; atomic symbol, weight, density, number of protons, electronegativity.
Astatine Element | Uses, Facts, Physical & Chemical Characteristics
网页Definition, mass & chemical names. Astatine is a highly radioactive element and the heaviest member of halogen family. It was discovered in 1940. History and Discovery. The existence of astatine was predicted in the halogen family under iodine by …
Astatine – Atomic Number – At - Periodic Table of Elements
网页2020年11月21日 · Astatine is a chemical element with atomic number 85 which means there are 85 protons and 85 electrons in the atomic structure.
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 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. The element is similar to its lighter congener, iodine.
Astatine - The Chemical Elements
网页2020年4月9日 · Astatine is a radioactive chemical element with an atomic number 85 in the periodic table of elements. The total amount of astatine found naturally in the Earth’s crust is almost 25 grams at any given time, which makes astatine the …
Astatine (At) - Chemical Elements.com
网页Name: Astatine. Symbol: At. Atomic Number: 85. Atomic Mass: (210.0) amu. Melting Point: 302.0 °C (575.15 K, 575.6 °F) Boiling Point: 337.0 °C (610.15 K, 638.6 °F) Number of Protons/Electrons: 85. Number of Neutrons: 125. Classification: Halogen.