Question

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 fluorines outer shell. c the addition of an outer (higher) energy level in the fluoride ion. d decreased attraction between the lithium and fluoride ions.

Explanation:

Lithium fluoride is an ionic compound. Lithium has a tendency to lose its valence - electron and fluorine has a high electronegativity to gain an electron. The formation of lithium fluoride is mainly due to the strong electrostatic attraction between the lithium cation and fluoride anion after electron - transfer, which is related to the completion of fluorine's outer - shell to achieve a stable electron configuration.

Answer:

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