The formation of lithium fluoride (seen here) is due to a) a stronger pull by the lithium atom on its valence electron. b) increased stability in the completion of fluorine's outer shell. c) the addition of an outer (higher) energy level in the fluoride ion. d) decreased attraction attraction between the lithium and fluoride ions.

Correct

Lithium fluoride is created due to the increased stability in the completion of fluorine's outer shell. By moving one electron from lithium, its outer shell is now full (with two). Additionally, by adding this electron to fluorine, it gains a full, stable octet.

B. increased stability in the completion of fluorine's outer shell.

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explanation:

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