|
Atomistry » Astatine | ||
Atomistry » Astatine » Isotopes » Energy » Production » Application » |
Element Astatine, At, HalogeneHistory
Before its actual discovery the existence of element 85 was known as eka-iodine predicted and named by D.I. Mendeleyev. Reports about its discovery appeared several times, but however no one of them was confirmed. One of the isotopes, no stable isotopes.
Occurrence
Halogene Astatine is the rarest of natural elements. The outer 1.6 km deep layer of the Earth's crust only 70 mg astatine had been found. It is permanently present because the most short-life isotopes are constituent part of the radioactive series of Uranium-235 and Uranium-238. The rate of their natural synthesis equals to the radioactive decay, so astatine total amount in the crust is unchangeable.
Neighbours |
Last articlesFe in 2YXOFe in 2YRS Fe in 2YXC Fe in 2YNM Fe in 2YVJ Fe in 2YP1 Fe in 2YU2 Fe in 2YU1 Fe in 2YQB Fe in 2YOO |
© Copyright 2008-2020 by atomistry.com | ||
Home | Site Map | Copyright | Contact us | Privacy |