Question

Magnesium is an alkaline earth metal with an atomic number of 12. It’s 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?

Answer 1

group # = # valence electrons

group 2= 2 valence electrons

Step-by-step explanation:

Mg is in group #2 and subsequently has 2 valence electrons (electrons on the outermost shell)