How many valence electrons does each group have?

It really depends on what group because Group 1 atoms have 1 and group 2 atoms have 2 and so on

2 valence electrons You can get the valence electrons in an atom's electronic arrangement by consulting the periodic table: The Group 1 atoms have 1 valence electron. The Group 2 atoms have 2 valence electrons. The Group 3 atoms have 3 valence electrons