Astatine - Wikipedia
网页The bulk properties of astatine are not known with certainty. Many of them have been estimated from its position on the periodic table as a heavier analog of fluorine, chlorine, bromine, and iodine, the four stable halogens.
Astatine - Element information, properties and uses ...
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 - Periodic Table
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 Dmitir Mendellev (1869) and by Neild Bohr.
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) - 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.
Astatine - Periodic Table
网页Astatine - Properties, history, name origin, facts, applications, isotopes, electronic configuation, crystal structure, hazards and more; Interactive periodic table of the chemical elements.
Astatine - Periodic Table
网页Pictures, stories, and facts about the element Astatine in the Periodic Table. Astatine occurs in vanishingly small quantities in the natural decay chains of uranium and thorium minerals. You can't see any of it in this rock, but a few atoms are (probably) there from time to time. Scroll down to see examples of Astatine.