bromine

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bromine

(brō`mēn, –mĭn) [Gr.,=stench], volatile, liquid chemical element; symbol Br; at. no. 35; at. wt. 79.904; m.p. –7.2°C;; b.p. 58.78°C;; sp. gr. of liquid 3.12 at 20°C;; density of vapor 7.14 grams per liter at STPSTP
or standard temperature and pressure,
standard conditions for measurement of the properties of matter. The standard temperature is the freezing point of pure water, 0°C; or 273.15°K;.
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; valence −1, +1, +3, +5, or +7. At ordinary temperatures bromine is a brownish-red liquid that gives off a similarly colored vapor with an offensive, suffocating odor. It is a member of the halogenhalogen
[Gr.,=salt-bearing], any of the chemically active elements found in Group 17 of the periodic table; the name applies especially to fluorine (symbol F), chlorine (Cl), bromine (Br), and iodine (I).
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 family in Group 17 of the periodic tableperiodic table,
chart of the elements arranged according to the periodic law discovered by Dmitri I. Mendeleev and revised by Henry G. J. Moseley. In the periodic table the elements are arranged in columns and rows according to increasing atomic number (see the table entitled
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. It is the only nonmetallic element that is liquid under ordinary conditions. It is soluble in water to some extent; the aqueous solution, called bromine water, acts as an oxidizing agent. It is also soluble in alcohol, ether, and carbon disulfide. Bromine is less active chemically than chlorinechlorine
[Gr.,=green], gaseous chemical element; symbol Cl; at. no. 17; interval in which at. wt. ranges 35.446–35.457; m.p. −100.98°C;; b.p. −34.6°C;; density 3.2 grams per liter at STP; valence −1, +1, +3, +5, +7.
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 or fluorinefluorine
, gaseous chemical element; symbol F; at. no. 9; at. wt. 18.9984; m.p. −219.6°C;; b.p. −188.14°C;; density 1.696 grams per liter at STP; valence −1. Fluorine is a yellowish, poisonous, highly corrosive gas.
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 but is more active than iodineiodine
[Gr.,=violet], nonmetallic chemical element; symbol I; at. no. 53; at. wt. 126.90447; m.p. 113.5°C;; b.p. 184.35°C;; sp. gr. 4.93 at 20°C;; valence −1, +1, +3, +5, or +7.
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. It forms compounds similar to those of the other halogens (see bromidebromide,
any of a group of compounds that contain bromine and a more electropositive element or radical. Bromides are formed by the reaction of bromine or a bromide with another substance; they are widely distributed in nature.
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). Oxides of bromine are unstable, but two acids, hypobromous acid, HBrO, and bromic acid, HBrO3, are known with their salts. Hydrobromic acid is the aqueous solution of hydrogen bromide, HBr. Bromine does not occur uncombined in nature but is found in combination with other elements, notably sodium, potassium, magnesium, and silver. In compounds it is present in seawater, in mineral springs, and in common salt deposits, e.g., those at Stassfurt, Germany. It occurs in the United States, principally in Michigan, Ohio, and West Virginia. Bromine for commercial purposes is obtained by treating brines (from salt wells or seawater) with chlorine, which displaces the bromine. It is important in the preparation of organic compounds, such as ethylene dibromide, which is used in conjunction with an antiknock compound in gasoline. Bromine has a powerful corrosive action on the skin, destroying the tissue, and the vapor is strongly irritating to the eyes and the membranes of the nose and throat. The element was discovered in seawater by Antoine Jérôme Balard in 1826.
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bromine

[′brō‚mēn]
(chemistry)
A chemical element, symbol Br, atomic number 35, atomic weight 79.904; used to make dibromide ethylene and in organic synthesis and plastics.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

bromine

a pungent dark red volatile liquid element of the halogen series that occurs in natural brine and is used in the production of chemicals, esp ethylene dibromide. Symbol: Br; atomic no.: 35; atomic wt.: 79.904; valency: 1, 3, 5, or 7; relative density 3.12; density (gas): 7.59 kg/m3; melting pt.: --7.2°C; boiling pt.: 58.78°C
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
However, in the present study, no significant difference was observed in genotypes distribution of the functional polymorphisms 587C>T of KNG, 287 bp I/D of ACE, 9 bp I/D of BR2, -58T>C of BR2, and -699G>C of BR1 between RA patients and controls.
Accuracy of double compression detection by the proposed method (%) BR1 BR2 64 80 96 112 128 160 192 64 95.78 98.07 98.84 99.11 99.93 100 100 80 81.23 94.77 99.67 99.83 98.76 100 100 96 74.90 90.56 98.72 99.13 99.89 99.93 99.89 112 64.53 75.01 76.91 99.14 100 100 100 128 60.77 63.12 64.56 92.91 99.74 99.89 100 160 50.67 52.14 57.09 94.54 97.89 99.45 100 192 50.78 51.23 57.99 93.56 96.32 97.09 98.26 Table 3.
We investigated the effect of the initial concentration of the dye adsorption process, in a wide range of concentrations between 10 and 250 mg [L.sup.-1] at 25[degrees]C and natural pH values (74 for NB, 71 for ChS, and 6.7 for BR2).
The produced composite armor samples were tested at the BR2 ballistic level against Parabellum 9 mm round tip, soft core bullet projectile which was shot towards the fiber-cement layer at the ballistic laboratories of Makina Kimya Enstitusu (MKE) in Ankara.
The dibromination of indanonewas successfully carried out by refluxing indan-1-one with Br2 in the presence of H2SO4 and/or AcOH.
The specificity of BR1 and BR2 was tested against the DNA isolated from 49 Trichoderma species, The primer pair, BR1 and BR2, amplified an 1.5 KB product with T.
For the flyover BR2, there are four sections of continuous spans with a total length of 252m and a typical width of 252m.
The secondary vortices of BR2 were evolved at Re = 10,000.
The bedrooms (BR1, BR2 and BR2) were assigned as occupied and conditioned between 11pm-6am.
The kennel address is Layhams Road, Keston, Kent, BR2 6AR.
Policymakers increased the base of reference capital on which reserve requirements on term deposits are calculated to BRL3.5bn from BR2.5bn.