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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 How to use valence in a sentence
  • What Are Valence Electrons? Definition and Periodic Table
    A valence electron is an outer shell electron that can participate in a chemical bond with another atom In chemistry and physics, a valence electron is an electron associated with an atom that can form a chemical bond and participate in a chemical reactions Valence electrons are outer shell electrons for main group elements





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