On the periodic table, lithium and beryllium are in different groups. Which statement describes why the two elements are in different groups?(1 point) Responses They are different colors. They are different colors. They have a different number of electron shells. They have a different number of electron shells. They have a different number of electrons in their outer shells. They have a different number of electrons in their outer shells. They have different atomic numbers.
1 answer
They have a different number of electrons in their outer shells.