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English definition of “valency”

valency

noun [C]     /ˈveɪ.lən.si/ (also valence) specialized
a measurement that 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.Chemistry - general words
(Definition of valency noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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