In which group all the elements do not have same number of valence electrons?

The group in which all the elemets do not have same number of valency electron is :

The group in the modern periode table, in which all the elements do not have same number of electrons in their valence shell is :

The group in the modern periode table, in which all the elements do not have same number of electrons in their valence shell is :

State whether the following statements are True or False: All the elements of a group have the same number of valence electrons.

The element which has the maximum number of valence electrons is:

A part of periodic table is shown in the following figure Will elements 'R' and 'S' have same number of valence electrons ?