debbie0707 debbie0707 23-09-2022 Biology contestada a 4 Magnesium is an alkaline earth metal with an atomic number of 12 Its in the third row in the periodic table. Which expression shows one way to find the number of valence electrons in one atom of magnesium? A. 12x3 B. 12 divided by 3 C. (12-8)-2 D. (12-2)+8 E. (12+2)-8