How does the octet rule explain the formation of a bromide ion?
A) When a bromine atom loses one valence electron, its third energy level has a complete octet.
B) When a bromine atom gains one valence electron, its fourth energy level has a complete octet, so it attains [Ar] electron configuration.
C) When a bromine atom gains one valence electron, its fourth energy level has a complete octet.
D) When a bromine atom gains one valence electron, its third energy level has a complete octet, so it attains [Xe] electron configuration.