An atom's Lewis dot structure has two dots. Which of the following elements could it be, and why?
A)Calcium, because it is an alkaline earth metal with two inner shell electrons. B)Carbon, because it has two electrons in its outermost p sub level.
C)Lithium, because it is a group 1 element with two bonding electrons. D)Magnesium, because it is a group 2 element with two valence electrons.