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QUESTION

# What is the formula for lithium sulfide?

"Li"_2"S"

Lithium sulfide is an ionic compound composed of lithium cations, "Li"^(+), and sulfide anions, "S"^(2-).

In order for the compound to be neutral, you need to have two lithium cations to balance the negative charge of the sulfide anions. This means that the chemical formula for lithium sulfide will be

"Li"_2"S"