What does the group number of the periodic table tell you about the structure of an atom?

Answer 1

the group number,element in some way describes the number of valence electrons or the property that they exhibit

Answer 2

The group number of an atom in the Periodic Table tells you the number of valence electrons that atom has. Valence electrons are involved in the atom's chemical reactions and determine its chemical properties. Atoms in the same group have similar chemical behaviors due to having the same number of valence electrons.