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valence    音标拼音: [v'eləns]
n. 原子价

原子价

valence
n 1: (biology) a relative capacity to unite or react or interact
as with antigens or a biological substrate [synonym: {valence},
{valency}]
2: (chemistry) a property of atoms or radicals; their combining
power given in terms of the number of hydrogen atoms (or the
equivalent) [synonym: {valence}, {valency}]

Valance \Val"ance\, n. [Perhaps fr. OF. avalant descending,
hanging down, p. pr. of avaler to go down, let down, descend
(cf. {Avalanche}); but probably from the town of Valence in
France.]
[1913 Webster]
1. Hanging drapery for a bed, couch, window, or the like,
especially that which hangs around a bedstead, from the
bed to the floor. [Written also {valence}.]
[1913 Webster]

Valance of Venice gold in needlework. --Shak.
[1913 Webster]

2. The drooping edging of the lid of a trunk, which covers
the joint when the lid is closed.
[1913 Webster]


Valence \Va"lence\, n. [From L. valens, -entis, p. pr. of valere
to have power, to be strong. See {Valiant}.] (Chem.)
The degree of combining power of an atom (or radical) as
shown by the number of atoms of hydrogen (or of other monads,
as chlorine, sodium, etc.) with which it will combine, or for
which it can be substituted, or with which it can be
compared; thus, an atom of hydrogen is a monad, and has a
valence of one; the atoms of oxygen, nitrogen, and carbon are
respectively dyads, triads, and tetrads, and have a valence
respectively of two, three, and four.
[1913 Webster]

Note: The valence of certain elements varies in different
compounds. Valence in degree may extend as high as
seven or eight, as in the cases of iodine and osmium
respectively. The doctrine of valence has been of
fundamental importance in distinguishing the
equivalence from the atomic weight, and is an essential
factor in explaining the chemical structures of
compounds.
[1913 Webster]


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  • Valence (chemistry) - Wikipedia
    Valence is generally understood to be the number of chemical bonds that each atom of a given chemical element typically forms Double bonds are considered to be two bonds, triple bonds to be three, quadruple bonds to be four, quintuple bonds to be five and sextuple bonds to be six
  • VALENCE Definition Meaning | Dictionary. com
    The valence is determined by the number of electrons that an atom can lose, add, or share An atom's valence is positive if its own electrons are used in forming the bond, or negative if another atom's electrons are used
  • Valence | Atomic structure, Electron configuration Bonding | Britannica
    valence, in chemistry, the property of an element that determines the number of other atoms with which an atom of the element can combine Introduced in 1868, the term is used to express both the power of combination of an element in general and the numerical value of the power of combination
  • VALENCE Definition Meaning - Merriam-Webster
    : the combining power of an atom as shown by the number of electrons in its outermost energy level that are lost, gained, or shared in the formation of chemical bonds
  • Valence - Wikipedia
    Valence electron, electrons in the outer shell of an atom's energy levels Valence quarks, those quarks within a hadron that determine the hadron's quantum numbers
  • Valence, France: All You Must Know Before You Go (2026) - Tripadvisor
    Valence Tourism: Tripadvisor has 43,252 reviews of Valence Hotels, Attractions, and Restaurants making it your best Valence resource
  • VALENCE | definition in the Cambridge English Dictionary
    VALENCE meaning: the ability of an atom to combine with other atoms, measured by the number of electrons it will… Learn more
  • valence - Wiktionary, the free dictionary
    A valence diagram of methane showing that one carbon atom can combine with a maximum of four hydrogen atoms, or that it makes four electrons available to form covalent chemical bonds, which means that it has a valence (etymology 1, noun sense 1 1) of four or is tetravalent
  • Valence, France: travel guide, attractions and places to visit . . .
    Capital of the Drome department, Valence is a sleepy city overlooking the Rhone River An hour from Lyon and Grenoble and in close proximity to vineyards producing Crozes Hermitages, St Joseph and St Peray wines, the town is an established stop off for wine tours of the region
  • 4. 4: Valence - Chemistry LibreTexts
    This capacity is called valence, and it varies periodically with increasing atomic weight The noble gases all have valences of 0 because they almost never combine with any other element H and Cl both have the same valence





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