In the periodic table of elements, what do all of the elements in row 2 have in common?
A. An atom of each element can hold up to eight electrons in its outer energy level.
B. An atom of each element can hold up to two electrons in its outer energy level.
C. Each element is an alkaline earth metal.
D. Each element is a halogen.
E. Each element is dull, brittle, and breaks easily.
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