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R 2 C=CR 2 + Br 2 → R 2 C(Br)−C(Br)R 2. Bromine is deeply colored but R 2 C(Br)−C(Br)R 2 is not. Thus, the consumption of bromine can often be gauged visually. Alternatively and more quantitatively, the bromine consumed by a sample can be determined by iodometry. [1] The bromine number indicates the degree of unsaturation of a sample. The ...
Bromine-77 is the most stable radioisotope of bromine, with a half-life of 57 hours. [13] Although β + decay is possible for this isotope, about 99.3% of decays are by electron capture. [ 9 ] Despite its complex emission spectrum, featuring strong gamma-ray emissions at 239, 297, 521, and 579 keV, [ 14 ] 77 Br was used in SPECT imaging in the ...
Bond energies to bromine tend to be lower than those to chlorine but higher than those to iodine, and bromine is a weaker oxidising agent than chlorine but a stronger one than iodine. This can be seen from the standard electrode potentials of the X 2 /X − couples (F, +2.866 V; Cl, +1.395 V; Br, +1.087 V; I, +0.615 V; At, approximately +0.3 V ...
For other isotopes, the isotopic mass is usually within 0.1 u of the mass number. For example, 35 Cl (17 protons and 18 neutrons) has a mass number of 35 and an isotopic mass of 34.96885. [7] The difference of the actual isotopic mass minus the mass number of an atom is known as the mass excess, [8] which for 35 Cl is –0.03115.
The only chemical elements that form stable homonuclear diatomic molecules at standard temperature and pressure (STP) (or at typical laboratory conditions of 1 bar and 25 °C) are the gases hydrogen (H 2), nitrogen (N 2), oxygen (O 2), fluorine (F 2), and chlorine (Cl 2), and the liquid bromine (Br 2). [1]
Beryllium bromide is the chemical compound with the formula BeBr 2. It is very hygroscopic and dissolves well in water. The Be2+ cation, which is relevant to BeBr 2, is characterized by the highest known charge density (Z/r = 6.45), making it one of the hardest cations and a very strong Lewis acid. [3]
A number of hydrates are known, 2SnBr 2 ·H 2 O, 3SnBr 2 ·H 2 O & 6SnBr 2 ·5H 2 O which in the solid phase have tin coordinated by a distorted trigonal prism of 6 bromine atoms with Br or H 2 O capping 1 or 2 faces. [3] When dissolved in HBr the pyramidal SnBr 3 − ion is formed. [3] Like SnCl 2 it is a reducing agent.
Mercury (I) bromide or mercurous bromide is the chemical compound composed of mercury and bromine with the formula Hg 2 Br 2. It changes color from white to yellow when heated [1] and fluoresces a salmon color when exposed to ultraviolet light. It has applications in acousto-optical devices.