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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
  • Halogen lamp - Wikipedia
    A halogen lamp (also called tungsten halogen, quartz-halogen, and quartz iodine lamp) is an incandescent lamp consisting of a tungsten filament sealed in a compact transparent envelope that is filled with a mixture of an inert gas and a small amount of a halogen, such as iodine or bromine
  • 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
  • 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
  • 4. 6: Halogens and Halides - Chemistry LibreTexts
    The origin of halogen is the Greek word meaning the production of salt by direct reaction with a metal Since their reactivity is very high, halogens are found in nature only as compounds
  • Halogen Elements and Properties - ThoughtCo
    Halogens are unique because they can exist as solids, liquids, and gases at room temperature Halogens have seven valence electrons and very high electronegativities, making them very reactive Because halogens are so reactive, they are useful in making disinfectants and preventing tooth decay
  • 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
  • HALOGEN Definition Meaning - Merriam-Webster
    The meaning of HALOGEN is any of the five elements fluorine, chlorine, bromine, iodine, and astatine that form part of group VIIA of the periodic table and exist in the free state normally as diatomic molecules





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