Question

the electron dot diagrams of calcium and magnesium are shown. both elements have the same number of valence electrons. in what other way are these elements the same? both elements have the same atomic mass. both elements have the same atomic number. both elements are in the same group on the periodic table. both elements are in the same period on the periodic table. ca: calcium mg: magnesium

Explanation:

Calcium (Ca) and magnesium (Mg) are both alkaline - earth metals. They have the same number of valence electrons (2) and are located in Group 2 of the periodic table. Their atomic masses and atomic numbers are different, and they are in different periods (Mg in Period 3, Ca in Period 4).

Answer:

C. Both elements are in the same group on the periodic table.