There are 2 main definitions of valence in English:

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valence 1

Pronunciation: /ˈveɪl(ə)ns/

noun

Chemistry & Linguistics
1 another term for valency.
Example sentences
  • The difference in the valence of phosphorous and silicon provides the free electrons needed for metal-like behaviour.
  • These data can only be explained if one assumes that the affective valence of the prime is processed, even though this is not necessary for the task at hand.
1.1 [as modifier] Relating to or denoting electrons involved in or available for chemical bond formation: molecules with unpaired valence electrons
More example sentences
  • Nonmetals with eight valence electrons are chemically unreactive.
  • The electrons in the highest energy level are called valence electrons.
  • The metalloids have an intermediate number of valence electrons.

Words that rhyme with valence

bivalence, covalence, surveillance
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There are 2 main definitions of valence in English:

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valence 2

noun

Variant spelling of valance.
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