Question

how to find formula of given compound if valence or electronic configuration is given?

Answer 1

u have to write the valency of elements below them and by criss cross method u can find the formula of compound.

for example - to find formula of magnesium chloride.

valency of magnesium is +2 and valency of chlorine is -1

so we will write their valence below them

Mg Cl
2 1

so by criss cross method its formula will be MgCl2.

hope it helps you