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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 Definition Meaning - Merriam-Webster
    The meaning of VALENCE is the degree of combining power of an element as shown by the number of atomic weights of a monovalent element (such as hydrogen) with which the atomic weight of the element will combine or for which it can be substituted or with which it can be compared
  • 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
  • Aerospace Metal Finishing | Valence Surface Technologies
    From the smallest part to a large aerostructure assembly, Valence is your one-stop-shop in the supply chain for metal finishing Valence is Nadcap, AS9100, and ITAR certified
  • 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
  • Valences AI the Workforce Series
    Learn about our upcoming summits and explore highlights from past events, with detailed use cases and learnings from real-world AI deployments
  • 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
  • What Are Valence Electrons? Definition and Periodic Table
    The number of valence electrons in an atom may have the same or different numerical value as its oxidation state For example, a lithium atom has 1 valence electron and has an oxidation state of +1
  • 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
  • Valences of the Chemical Elements - ThoughtCo
    This table of element valences includes the maximum valence and most common valence values in chemistry Use this for reference with a periodic table
  • Valence Electrons Chart for All Elements - Periodic Table Guide
    For main group elements (i e s-block and p-block elements), the valence electrons are the electrons present in the outermost orbit But for most of the transition and inner transition elements, the valence electrons are the electrons present in the shells outside the noble gas core





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