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halogen    音标拼音: [h'ælədʒən]
n. 卤素

卤素

halogen
n 1: 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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  • Halogen - Wikipedia
    Halogen lamps are a type of incandescent lamp using a tungsten filament in bulbs that have small amounts of a halogen, such as iodine or bromine added This enables the production of lamps that are much smaller than non-halogen incandescent lightbulbs at the same wattage
  • Halogen | Elements, Examples, Properties, Uses, Facts | Britannica
    Halogen, any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts) Learn more about the properties of halogens in this article
  • Halogen Elements - List and Facts
    Learn about the halogen elements See where they are on the periodic table Get the list of halogens and learn about their properties
  • List of Halogens (Element Groups) - ThoughtCo
    The halogens are the elements in group 17 of the periodic table This is the next-to-last column of elements on the righthand side of the table The halogen elements are fluorine, chlorine, bromine, iodine, astatine, and possibly tennessine The halogens are highly reactive nonmetallic elements
  • Halogen Free_百度百科
    卤素化合物广泛用作 阻燃剂 （如PBB、 PBDE）、制冷剂、农药等，但其燃烧时释放 卤化氢 等有毒气体，可能损害人体呼吸系统，并与水蒸气结合产生腐蚀性物质。 部分卤化物具有 环境荷尔蒙 特性，可能影响免疫、内分泌及生殖系统。 相关法规包括欧盟2002 95 EC限制溴类阻燃剂，《蒙特利尔议定书》管控氟氯烷化合物，《斯德哥尔摩公约》限制有机氯污染物。 IEC 61249-2-21规定印制板材料中氯、溴及总卤素的最大限量。 无卤化标准要求卤素总量＜1500ppm，氯与溴各＜900ppm，燃烧后卤化氢＜100ppm且水溶液PH值≥4 3，透光率≥60%。 卤素 是指 氟 (F)、 氯 (Cl)、 溴 (Br)、 碘 (I)四种元素，在工业和日常讨论中，常指这四种元素。
  • Halogens - YouTube
    It discusses properties of the halogens such as reactivity, electronegativity, boiling point, and atomic radius more This chemistry video provides a basic introduction into the halogens -
  • Halogens - Chemistry Encyclopedia - uses, elements, gas, number, name . . .
    The halogens are the family of chemical elements that includes fluorine (atomic symbol F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At) The halogens make up Group VIIA of the Periodic Table of the elements Elemental halogens are diatomic molecules
  • 6. 12: Halogens - Chemistry LibreTexts
    The term “halogen” means “salt-former” because these elements will readily react with alkali metal and alkaline earth metals to form halide salts The halogens all have the general electron configuration n s 2 n p 5, giving them seven valence electrons
  • The Halogen Bond | Chemical Reviews
    The formation of halogen-bonded complexes involving bromine and chlorine as electron acceptor species was first reported at the end of the 19th century by I Remsen and J F Norris, who described the 1:1 dimers formed by Br2and Cl2with various amines
  • Halogens - Chemistry Learner
    Halogens are located on the right and found in group VIIa (new IUPAC) or group 17 (CAS) of the periodic table Halogens have physical and chemical properties which are typical of non-metal





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