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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.

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Answer:

When a neutral atom gains or loses electrons, it becomes an ion. ... needs only two valence electrons to fill its outermost energy level.

sorry if not right :(

Explanation:

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