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.

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.

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
References in periodicals archive ?
The dibromination of indanonewas successfully carried out by refluxing indan-1-one with Br2 in the presence of H2SO4 and/or AcOH.
Thanks to the researches of Keri Davies and Marsha Keith Schuchard, published too late for BR2 ("Recovering the Lost Moravian History of William Blake's Family," Blake: An illustrated Quarterly 38 [2004]: 36-43), we have learned that Catherine and Thomas Armitage (d.
After lab testing and data analysis was complete, it was determined that the BR2 area was a possible structural fill candidate.
This panel represents multi-site recording of action-potential signals from axonal branches Br2, Br3, and Br4, evoked by a transmembrane current step (Fig.
The nonrandom aspect of the controls was due to the dominance of Br2 to Br1 birds.
The tax laws of A and B classify CFC3 and BR2 as separate, nonfiscally transparent entities.
For each of ci alternatives saved in BR, (the first register pushed into the Resume array), the recognizer may consider at most c sub 2 interpretations saved in BR2 (the second register pushed into Resume).
Roadworks in Sefton |Park/Ullet Road area affecting 60, 75, 76, 80, 80E, 672, 683 and BR2.
E/mal Oil Palm 5 5 8 5 4 BO3 LK Oil Palm 1 7 3 1 5 Bungku Oil Palm 1 2 7 3 6 BR3 Rubber 4 6 3 2 7 BO3 LK Rubber 6 -- 8 4 8 BR2 LK Rubber 1 6 -- -- No Soil sample code Average of Oxidation activity ([micro]M [day.
Aero-engines manufactured by Daimler included the French-designed Gnome Monosoupape rotary, the RAF 1 and 1a air-cooled V8s, the RAF 4a V12, the Le Rhone rotary, and the Bentley BR2 rotary.
Determination of Auxin Biosynthesis: Isolates of Rhizobium species of chickpea (Cp1, Cp2, and Cp3), berseem (Br1, Br2 and Br3) and lentil (Lt1, Lt2 and Lt3) were screened for their auxin biosynthesis potential in the presence and absence of L-TRP colormetrically.