Question

select the correct answer
in the periodic table of elements, what do all of the elements in group 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 six 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

Explanation:

Elements in group 2 of the periodic table are known as alkaline - earth metals. They have 2 valence electrons. Option A and B are about the general capacity of outer - energy levels not specific to group 2. Halogens are in group 17. And group 2 elements are metals which are not dull, brittle and break easily.

Answer:

C. Each element is an alkaline earth metal