Question

An element Z has a valency of 4. Write the formula for its sulfate.

Answer 1

It is given that the valency of an element $\mathrm{Z}$ is $4$, the molecular formula for its sulfate will be :

$$\begin{gathered} \mathrm{Symbol}\mathrm{Z}{\mathrm{SO}}_4 \\ \searrow \swarrow \\ \mathrm{Valency}4-2 \end{gathered}$$

As the valency of sulfate is $-2$. By applying the criss-cross method, molecular formula of sulfate of an element $\mathrm{Z}$ is ${\mathrm{Z}}_2{\mathrm{SO}}_4$