• WordNet 3.6
    • n halogen any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions
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Webster's Revised Unabridged Dictionary
    • n Halogen (Chem) An electro-negative element or radical, which, by combination with a metal, forms a haloid salt; especially, chlorine, fluorine, bromine, and iodine; sometimes, also cyanogen. See Chlorine family, under Chlorine.
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Century Dictionary and Cyclopedia
    • n halogen In chem., an element that forms a compound of a saline nature by its direct union with a metal. The halogens are chlorin, iodine, bromine, and fluorin, to which cyanogen may be added as a compound halogen.
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Chambers's Twentieth Century Dictionary
    • n Halogen hal′o-jen a substance which by combination with a metal forms a saline compound
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Webster's Revised Unabridged Dictionary
Gr. "a`ls "alo`s, salt + -gen,: cf. F. halogène,
Chambers's Twentieth Century Dictionary
Gr. hals, salt, genēs, producing.


In literature:

Halogens do not act directly on water, hence we may not properly speak of halogen substitution products.
"Scientific American Supplement No. 822" by Various
Also the salts of the halogens, such as the chlorides, iodides, bromides, etc., of the metals.
"A System of Instruction in the Practical Use of the Blowpipe" by Anonymous
We wouldn't have the chance of a hydrogen atom in a tank of halogens.
"The Colors of Space" by Marion Zimmer Bradley
Like ammonia it forms salts with the halogen acids.
"An Elementary Study of Chemistry" by William McPherson
The methods of treating with the halogens, viz.
"Researches on Cellulose" by C. F. Cross
In its properties it shows some analogy to the halogen acids, since it forms difficultly soluble lead, silver and mercurous salts.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1" by Various
We may, in fact, consider that the descriptive study of the various halogen compounds dates from about this time.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1" by Various
Halogen acids convert it into monohalogen fatty acids, and the halogens themselves convert it into dihalogen fatty acids.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4" by Various
The lignone complex reacts, by its unsaturated groups, with the halogens.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5" by Various
Because of these double linkages, they are all able to take on oxygen, hydrogen, or the halogen elements, by direct addition.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher

In news:

In a world of fusion cuisine and halogen-illuminated sushi bars, one local restaurant has just gotten a blast from its past.
Crystal ornaments catch the illumination from LED and halogen lights in this chandelier designed by Michael Sestak.
GENIESIS GIANT 32 Aluminum , bike, with Schwinn halogen lights and other accessories, brand new, $250 217-417-6428.
Aluminum , bike, with Schwinn halogen lights and other accessories, brand new, $250 217-417-6428.
Trail Tech's LED lights draw minimal power, are bright and have a good spread, but the throw isn't as far as some of the better halogens.
It is equipped with a 750W 55V (750W, 20000lm, 3200°K, 200h) halogen lamp.
Magnalight Announces Addition of Heavy Duty Quartz Halogen Work Area Light.
"The instant brightness factor makes our new hybrid halogen-CFL more versatile than other CFLs," says Kristin Gibbs, general manager of consumer marketing for GE Lighting.
MR16 lamps , also known as multi-mirror lamps , are halogen-type lamps designed in an integral multifaceted reflector and are renowned for their exceptional beam control.
The Martin Mania SCX600 is the second scanner in the Mania series, a powerful 250W halogen scanner with state-of-the-art optics.
This company has announced the availability of Multicore HF108, a lead-free, halogen-free solder paste that combines all of the benefits of robust lead-free materials with the advantage of no deliberately added halogen.
Wolf Appliance offers it Pro Wall Hood featuring heat sentry and dual setting halogen lighting.
StockerYale's Focusable LED Spot Projectors are high-intensity LED spotlights that are designed to replace conventional halogen point-sources as well as fiber optic illumination solutions.
5-Watt Retrofit LED Rivals Halogen Alternatives.
The SunBrite 5-Watt MR-16 Retrofit LED from Lumex is said to provide significant cost and performance benefits compared to halogen alternatives.

In science:

It can also happen that only one stoichiometric material will grow even from a mixture containing different halogen species.
Crystals for neutron scattering studies of quantum magnetism
This is due to an excitonic state induced by the intersite Coulomb repulsion between holes on the metal and halogen ions.
Excitonic effect on optical response in one-dimensional two-band Hubbard model
However, the real compounds such as the cuprates and the halogen-bridged Ni-compounds are the insulators of charge transfer type, where both half-filled d-orbitals and empty p-orbitals for holes exist in one-dimensional networks of the transition metal and ligand ions.
Excitonic effect on optical response in one-dimensional two-band Hubbard model
Coulomb interaction Ui are defined by ǫi = ∆ and Ui = Up for odd i (halogen ion), and ǫi = 0 and Ui = Ud for even i (metal ion), respectively.
Excitonic effect on optical response in one-dimensional two-band Hubbard model
Ni-compounds. We introduce the intersite Coulomb interaction V between holes on metal and neighboring halogen sites.
Excitonic effect on optical response in one-dimensional two-band Hubbard model