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-210, with a half-life of 8 1 hours
Astatine | Radioactive Halogen, Uses in Medicine Research - Britannica 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 – The Rarest Natural Element - Science Notes and Projects 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 - Simple English Wikipedia, the free encyclopedia Astatine is a radioactive, chemical element Its atomic number is 85, and its atomic weight is 210 It is part of the Group 17 on the periodic table of elements All of astatine's isotopes are short-lived; the most stable is astatine-210, with a half-life of 8 3 hours History
Facts About Astatine - Live Science 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 Element | Uses, Facts, Physical Chemical Characteristics Astatine is a shiny dark colored element Astatine is a radioactive element It is a semiconductor and can have metallic properties Astatine undergoes sublimation but less readily than iodine and have a low vapor pressure
Astatine Facts (Element 85 or At) - ThoughtCo 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 Element Facts - chemicool. com The chemical element astatine is classed as a halogen and a nonmetal It was discovered in 1940 by Dale R Coson, Kenneth Ross Mackenzie and Emilio Segrè The amount of naturally occurring astatine in the world is about 25g That’s the weight of five U S nickels
Astatine - New World Encyclopedia Astatine (chemical symbol At, atomic number 85) is the rarest naturally occurring chemical element It is a member of the halogen family of elements and is the heaviest halogen Its chemical properties appear to resemble those of iodine