Periodic table the periodic table of elements Select the correct answer. In the periodic table of elements, what do all of the elements in group 2 have in common? Group of answer choices Each element is a halogen. An atom of each element can hold up to six electrons in its outer energy level. Each element is an alkaline earth metal. An atom of each element can hold up to eight electrons in its outer energy level. Each element is dull, brittle, and breaks easily.