Search results
Results from the WOW.Com Content Network
Structure of astatine monoiodide, one of the astatine interhalogens and the heaviest known diatomic interhalogen. Astatine is known to react with its lighter homologs iodine, bromine, and chlorine in the vapor state; these reactions produce diatomic interhalogen compounds with formulas AtI, AtBr, and AtCl. [4]
Astatine has 24 known nuclear isomers, which are nuclei with one or more nucleons (protons or neutrons) in an excited state. A nuclear isomer may also be called a "meta-state", meaning the system has more internal energy than the "ground state" (the state with the lowest possible internal energy), making the former likely to decay into the ...
The least stable one is astatine-214m1; its half-life of 265 ns is shorter than those of all ground states except that of astatine-213. [5] Alpha decay energy follows the same trend as for other heavy elements. [11] Lighter astatine isotopes have quite high energies of alpha decay, which become lower as the nuclei become heavier.
Organoastatine chemistry describes the synthesis and properties of organoastatine compounds, chemical compounds containing a carbon to astatine chemical bond. Astatine is extremely radioactive, with the longest-lived isotope (210 At) having a half-life of only 8.1 hours. Consequently, organoastatine chemistry can only be studied by tracer ...
Astatine monoiodide (AtI) is made by direct combination of astatine and iodine. No astatine fluorides have been discovered yet. Their absence has been speculatively attributed to the extreme reactivity of such compounds, including the reaction of an initially formed fluoride with the walls of the glass container to form a non-volatile product.
The compound with the formula (C 5 H 5) 2 Fe 2 (CO) 4 exists as three isomers in solution. In one isomer the CO ligands are terminal. When a pair of CO are bridging, cis and trans isomers are possible depending on the location of the C 5 H 5 groups. [7] Another example in organometallic chemistry is the linkage isomerization of ...
However, it is limited in use due to its ready decomposition into elemental hydrogen and astatine, [5] as well as the short half-life of the various isotopes of astatine. Because the atoms have a nearly equal electronegativity , and as the At + ion has been observed, [ 6 ] dissociation could easily result in the hydrogen carrying the negative ...
Pages in category "Astatine compounds" The following 7 pages are in this category, out of 7 total. This list may not reflect recent changes. A. Astatine bromide;