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Lithium ions have a charge of +1 and fluoride ions have a charge of -1. The formula unit for lithium fluoride is LiF, which means that the lithium and fluoride ions are present in a 1:1 ratio. So the positive and negative charges cancel each other, and the compound lithium fluoride is neutral.

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Q: Why lithium fluoride is a neutral compound even though it is made up of ions that have posotive and negative charges?
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