User:Javedansari1234

The term valency is used to describe the combining power of the atoms with each other to form molecules.The valency of an atom may be defiend as'the number of hydrogen atoms or chlorine atoms or twice the number of oxygen atoms with which one atom of that element can combine.For example,valency of nitrogen in NH3' is 3,and the valency of mercury in HgO is 2.