English-Thai Dictionary
valence
N จำนวน อะตอม ของ ธาตุ ธาตุ หนึ่ง ที่ สามารถ ลดลง รวม หรือ แทน กับ จำนวน อะตอม ของ ธาตุ อื่น valency jam-nuan-a-tom-kong-tad-tad-nueng
Webster's 1913 Dictionary
VALENCE
Va "lence, n. Etym: [From L. valens, -entis, p. pr. of valere to have power, to be strong. See Valiant. ] (Chem. )
Defn: 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.
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.
New American Oxford Dictionary
valence
va lence |ˈvāləns ˈveɪləns | ▶noun Chemistry the combining power of an element, esp. as measured by the number of hydrogen atoms it can displace or combine with: carbon always has a valence of 4. • [ as modifier ] relating to or denoting electrons involved in or available for chemical bond formation: molecules with unpaired valence electrons. • Linguistics the number of grammatical elements with which a particular word, esp. a verb, combines in a sentence. ORIGIN late Middle English: from late Latin valentia ‘power, competence, ’ from valere ‘be well or strong. ’
Oxford Dictionary
valence
valence 1 |ˈveɪl (ə )ns | ▶noun Chemistry & Linguistics another term for valency. • [ as modifier ] relating to or denoting electrons involved in or available for chemical bond formation: molecules with unpaired valence electrons.
valence
valence 2 ▶noun variant spelling of valance.
Sanseido Wisdom Dictionary
valence
va lence /véɪləns /名詞 C U 1 〘化 〙原子価 .2 〘言 〙結合価 .3 〘生物 〙結合価 .
The Wordsmith Dictionary