Question

what is valency............ ..​

Answer 1

$\mathfrak{\huge{\orange{\underline{\underline{Answer :}}}}}$

Valency is the measure of the combining capacity of atoms or molecules. Therefore, it is the capacity of an atom of a single element to react and combine with particular numbers of atoms of another element.

Answer 2

Valency is the measure of the combining capacity of Atoms or Molecules . Therefore it is the capacity of an Atom of an single Element to react  and combine with particular number of Atoms of  another Element .