Which of the listed properties is the same for the elements beryllium (be), magnesium (mg), and calcium (ca)? reactivity atomic radii number of energy levels number of valence electrons

The correct answer is number of valence electrons.

Explanation:

Elements are distributed into 7 Periods and 18 groups in periodic table.

Elements that belong to same group show similar chemical properties because they have same number of valence electrons.

Beryllium belongs to Group 2 and period 2 of the periodic table.

Magnesium belongs to Group 2 and period 3 of the periodic table.

Calcium belongs to Group 2 and period 4 of the periodic table.

Hence, the correct answer is number of valence electrons.

gold is my favorite solid.

answer7,570,82356 cubic centimeters;