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Sodium astatide solution has been prepared by distilling astatine from the bismuth alpha-ray target where it was prepared, dissolving in sodium bicarbonate solution, and reducing At + and At 3+ ions with ascorbic acid.
Despite having a similar half-life to the previous isotope (8.1 hours for astatine-210 and 7.2 hours for astatine-211), the alpha decay probability is much higher for the latter: 41.81% against only 0.18%. [6] [h] The two following isotopes release even more energy, with astatine-213 releasing the most energy.
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] The first two compounds may also be produced in water – astatine reacts with iodine/iodide solution to form AtI, whereas AtBr requires (aside from ...
Number of isomers [3] [4] Number of isomers including stereoisomers [3] [5] Molecular Formula Name of straight chain Synonyms 1 1 1 CH 4: methane: methyl hydride; natural gas 2 1 1 C 2 H 6: ethane: dimethyl; ethyl hydride; methyl methane 3 1 1 C 3 H 8: propane: dimethyl methane; propyl hydride 4 2 2 C 4 H 10: n-butane: butyl hydride ...
Astatine has 23 nuclear isomers (nuclei with one or more nucleons – protons or neutrons – in an excited state). A nuclear isomer may also be called a " meta -state"; this means 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 latter.
Astatine bromide is an interhalogen compound with the chemical formula ... At 2 + 2 IBr → 2 AtBr + I 2 [1] Astatine bromide ... 4.0 License; additional terms ...
6.2 astatine-207: 1.80 6.5 bismuth-201: 1.80 6.5 protactinium-239: 1.8 6.5 fluorine-18: 1.8295 6.586 americium-245: 2.05 7.4 einsteinium-250m: 2.22 8.0 radon-210: 2.4 8.6 lead-198: 2.4 8.6 curium-238: 2.4 8.6 curium-239: 2.5 9.0 fermium-256: 2.627 9.46 yttrium-85: 2.68 9.6 actinium-224: 2.78 10.0 californium-247: 3.11 11.2 berkelium-250: 3.212 ...
2 HAt → H + + At − + H − + At + → H 2 + At 2. This results in elemental hydrogen gas and astatine precipitate. Furthermore, a trend for hydrogen halides, or HX, is that enthalpy of formation becomes less negative, i.e., decreases in magnitude but increases in absolute terms, as the halide becomes larger. Whereas hydroiodic acid ...