Question

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:

• Option A: Atoms of group 2 elements have 2 electrons in their outer energy level, not 8.
• Option B: Atoms of group 2 elements have 2 electrons in their outer energy level, not 6.
• Option C: Group 2 elements are known as alkaline earth metals. This is a correct classification.
• Option D: Halogens are in group 17, not group 2.
• Option E: Dull, brittle, and breaks easily are properties of non - metals. Group 2 elements are metals.

Answer:

C. Each element is an alkaline earth metal.