halogen


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halogen

(hăl`əjĕn) [Gr.,=salt-bearing], any of the chemically active elements found 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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; the name applies especially to 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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 (symbol F), 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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 (Cl), brominebromine
[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 STP; valence −1, +1, +3, +5, or +7.
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 (Br), and 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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 (I). Astatineastatine
[Gr.,=unstable], semimetallic radioactive chemical element; symbol At; at. no. 85; at. wt. of most stable isotope 210; m.p. 302°C; (estimated); b.p. 337°C; (estimated); density unknown; valence believed to be +1, +3, +5, or +7.
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 (At), formerly known as alabamine, is a radioactive element also classed as a halogen; its most stable isotope (which does not occur in nature) has a half-life of less than 8 1-2 hr. The chemical and physical properties of astatine are not well known; it is believed to resemble iodine. The halogens are the best-defined family of chemical elements. Chemically they closely resemble one another; they are nonmetallic and form monovalent negative ions. They also exhibit an almost perfect gradation of physical properties. Fluorine, a pale yellow gas, is the least dense and chemically the most active, displacing the other halogens from their compounds and even displacing oxygen from water. Chlorine, a yellow-green gas, is more dense and less reactive than fluorine. Bromine is a dark red liquid. Iodine is a grayish black solid and is the least chemically active of the four; however, among the nonmetals only oxygen is more reactive than iodine. Pure halogens exist as diatomic molecules, e.g., Cl2; they form interhalogen compounds, i.e., compounds between two halogens. The halogens form numerous compounds with other elements. With hydrogen they form hydrogen halides, whose water solutions are called hydrohalic acids, e.g., the water solution of hydrogen chloridehydrogen chloride,
chemical compound, HCl, a colorless, poisonous gas with an unpleasant, acrid odor. It is very soluble in water and readily soluble in alcohol and ether. It fumes in moist air. It is not flammable, and the liquid is a poor conductor of electricity.
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 is called hydrochloric acid. They form numerous metal halides, or saltssalt,
chemical compound (other than water) formed by a chemical reaction between an acid and a base (see acids and bases). Characteristics and Classification of Salts

The most familiar salt is sodium chloride, the principal component of common table salt.
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, e.g., sodium chloride, common table salt. They also form halocarbons, compounds with carbon and often other elements such as hydrogen and oxygen. Chloroformchloroform
or trichloromethane
, CHCl3, volatile, colorless, nonflammable liquid that has a sweetish taste and a somewhat pungent odor; it boils at 61.7°C;. It dissolves freely in ethanol and ether but does not mix with water.
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, iodoformiodoform
, CHI3, yellow crystalline solid that has a penetrating odor. It melts at 119°C; and is insoluble in water but soluble in ether or ethanol. Iodoform was formerly used as an antiseptic.
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, and carbon tetrachloridecarbon tetrachloride
or tetrachloromethane
, CCl4, colorless, poisonous, liquid organic compound that boils at 76.8°C;. It is toxic when absorbed through the skin or when inhaled. It reacts at high temperatures to form the poisonous gas phosgene.
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 are halocarbons. Some other halogen compounds are calomel (mercurous chloride), fluoritefluorite
or fluorspar
, mineral appearing in various colors, e.g., green, yellow-brown, rose, and red. Chemically, it is calcium fluoride, CaF2. Its crystals, commonly cubic, are transparent or translucent and under certain conditions exhibit fluorescence.
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, sal ammoniac (ammonium chlorideammonium chloride
, chemical compound, NH4Cl, a white or colorless, odorless, water-soluble, cubic crystalline salt with a biting taste, commonly known as sal ammoniac.
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), corrosive sublimate (mercuric chloridemercuric chloride
or mercury (II) chloride,
chemical compound, HgCl2, a white powder of colorless rhombohedral crystals, somewhat soluble in water. It is also called bichloride of mercury or corrosive sublimate. It is extremely poisonous.
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), and chlorine bleaches.

Halogen

A type of incandescent lamp with a higher energy efficiency than standard ones.

halogen

[′hal·ə·jən]
(chemistry)
Any of the elements of the halogen family, consisting of fluorine, chlorine, bromine, iodine, and astatine.

halogen

any of the chemical elements fluorine, chlorine, bromine, iodine, and astatine. They are all monovalent and readily form negative ions
References in periodicals archive ?
Halogen floor lamp bulbs caused a flurry of fires a few years back.
consumers can find GE's incandescent halogen bulbs--clear and Reveal[R] clear versions (MSRP $5-$7)--nationwide in two-packs in 29-, 43-, 53- and 72-watt varieties that dim and turn on instantly like their 40-, 60-, 75- and 100-watt incandescent bulb cousins that are phasing out of production between 2012 and 2014 as a result of the Energy Independence and Security Act of 2007 (learn more at www.
The safety standard at that time, UL57, the Standard for Electric Lighting Fixtures, did not address the new tungsten halogen lamp source with any clarity leaving too many products to fail in the field.
In broad terms, halogens are associated with PWBs and components, while halides are associated with soldering operations.
Halogen type * Reactive FR * Heat distortion, Impact
We're relaunching the halogen floor lamp segment with a totally new shape, not just the pan.
The big advantages of halogen lights are the drama and excitement they add.
Nitrogen has been shown to create a very wet dross, argon somewhat drier, with the driest dross created by halogen containing purge gases.
In contrast, the researchers failed to find any tumors in mice exposed to halogen lamps whose UV rays had been filtered out by inserting a plain glass cover over the bottom of the spotlight.
com/research/6f4db4/research_report_on) has announced the addition of the "Research Report on China's Low Smoke Halogen Free Flame Retardant Polypropylene (PP) Industry - 2011-2012" report to their offering.
M2 EQUITYBITES-February 24, 2017-Saba Software to Acquire Canadian Performance Management Specialist Halogen Software
In October 2009, the halogen track lighting in the museum's Booker T.