From the group number we understand that the general outer electronic configuration and number of valence electrons and valencies of the three elements are:
i. S is more electronegative than Ge.
Therefore, the empirical formula of the compound formed by these two elements is predicted by the method of cross
multiplication of the valencies:
ii. Br is more electronegative than Ge. The empirical formula of the compound formed by these two elements is predicted by the method of cross multiplication of valencies:
[Note: More electronegative element is written on right hand side in cross multiplication method.]