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valency noun
/ˈveɪ.lənt .si/ n [C] (also valence) specialized Definition
a measurement which shows the number of hydrogen atoms that can combine with one atom of a particular chemical element to make a compound, used to describe how easily an element can connect in a chemical way with others
Zinc has a valency of 2.
(Definition of valency noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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