Question

Write the chemicalformule
using valency for

the following​

Answer 1

$\bf \huge \underline \pink{answer}$

The valency of an element is related to how many electrons are in the outer shell. The noble gases have the valency 0 as they do not usually combine with other elements. To write the chemical formula for a compound it is best to use the S.V.S.D.F system. S - write down the symbols of both the elements involved.