Which is most similar for the elements in a group in the periodic table?

The elements of a group in the periodic table

Which is true for an element R present in group 13 of the periodic table

Which of these elements belongs to Group VI A in periodic table?

The most basic oxide of elements group 14 of the periodic table is:

The most basic oxide of elements group 14 of the periodic table is:

Similarity in chemical properties of the atoms of elements in a group of the periodic table is most closely related to