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Valency is the combining power of an element. It is governed by the number of electrons in the outermost electronic shell of the atoms of that element.
Valence, also known as valency or valency number, is a measure of the number of chemical bonds formed by the atoms of a given element.
Valency is the numerical value of the charge on an ion (cation or anion), describing the number of bonds which can be formed by the ion.