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halogens    
n. 卤素

卤素

Chlorine \Chlo"rine\, n. [Gr. ? pale green, greenish yellow. So
named from its color. See {Yellow}.] (Chem.)
One of the elementary substances, commonly isolated as a
greenish yellow gas, two and one half times as heavy as air,
of an intensely disagreeable suffocating odor, and
exceedingly poisonous. It is abundant in nature, the most
important compound being common salt (Sodium chloride). It is
powerful oxidizing, bleaching, and disinfecting agent. Symbol
Cl. Atomic weight, 35.4.
[1913 Webster]

{Chlorine family}, the elements fluorine, chlorine, bromine,
and iodine, called the {halogens}, and classed together
from their common peculiarities.
[1913 Webster]


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  • Halogen - Wikipedia
    The halogens ( ˈhælədʒən, ˈheɪ -, - loʊ -, - ˌdʒɛn [1][2][3]) are a group in the periodic table consisting of six chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and the radioactive elements astatine (At) and tennessine (Ts), though some authors [4] would exclude tennessine as its chemistry is unknown and i
  • 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
    The halogens are group VII or 7 in older nomenclature and group 17 in modern IUPAC nomenclature Here is a list of the halogens and a look at their properties, uses, and biological role
  • Halogen Elements and Properties - ThoughtCo
    The halogens are a group of elements on the periodic table It is the only element group that includes elements capable of existing in three of the four main states of matter at room temperature: solid, liquid, and gas
  • Group 17: General Properties of Halogens - Chemistry LibreTexts
    The halogens are located on the left of the noble gases on the periodic table These five toxic, non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At)
  • Physical properties of the halogens - Group 7 - BBC
    Learn about and revise the halogens in group 7 of the periodic table with this BBC Bitesize GCSE Combined Science (Edexcel) study guide
  • Halogen Properties - BYJUS
    Halogens have seven valence electrons; because halogens have one electron missing, they form negative ions and are highly reactive They can gain an electron by reacting with atoms of other elements
  • Halogens - Chemistry Learner
    Definition: What are halogens? Halogens are special category of highly reactive, non-metal elements which fall in group VIIa of the periodic table Because of their high reactivity, the halogen family do not exist in nature in their native form, i e in monoatomic form
  • 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
  • Halogens – Periodic Table - ChemTalk
    The halogens, aka halogen family, are a group of reactive elements in group 17 of the periodic table, to the right of the chalcogens, and to the left of the noble gases





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