Question

what do you mean by valency ​

Answer 1

the valency of an element is a measure of its combining power with other elements

or

in other words

the number of electrons that an atom can loss gain or share during a chemical reaction is called valency.

Explanation:

Now, understood

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Answer 2

Answer:

The valency of an element is a measure of number of atoms with which one atom of the element can combine during chemical reactions.

Explanation:

The valency of an element is a measure of number of atoms with which one atom of the element can combine during chemical reactions. Valency of common elements is useful for writing the chemical formula of compounds.