Astatine is a chemical element with the 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. A sample of the pure element has never been assembled, because any macroscopic specimen would be immediately vaporized by the heat of its own radioactivity. Webastatine, Radioactive chemical element and the heaviest halogen element, chemical symbol At, atomic number 85. It was first synthetically produced in 1940 from the …
Astatine chemical element Britannica
WebApr 5, 2024 · carbon (C), nonmetallic chemical element in Group 14 (IVa) of the periodic table. Although widely distributed in nature, carbon is not particularly plentiful—it makes up only about 0.025 percent of Earth’s crust—yet it forms more compounds than all the other elements combined. In 1961 the isotope carbon-12 was selected to replace oxygen as … WebJan 18, 2024 · The chemical symbol for astatine is At. This element is in period 6 group 17 on the periodic table. It is a part of the halogen family, which is a group of … snl debbie downer actress
Astatine - Introduction, Structure, Uses, Health Effects and FAQ
WebNov 21, 2024 · Astatine is a chemical element with atomic number 85 which means there are 85 protons and 85 electrons in the atomic structure. The chemical symbol for … WebMar 9, 2024 · astatine (At), radioactive chemical element and the heaviest member of the halogen elements, or Group 17 (VIIa) of the periodic … WebThe atomic or chemical symbol of Astatine is At named after ‘astatos’, a Greek word for unstable form. Atomic symbol of Astatine with atomic mass and atomic number on extreme top left and bottom left. Astatine group in periodic table The group that Astatine belongs to in a periodic table is 17. It belongs to a halogen family. snl drew barrymore