The following Lewis diagram represents the valence electron configuration of a main-group element.

The following Lewis diagram represents the valence electron configuration of a main-group element. -X: This element is in group According to the octet rule, this element would be expected to form a(n) with a charge of If X is in period 4 , the ion formed has the same electron configuration as the noble gas The symbol for the ion is 2 more group attempts remaining