To determine the formula for the compound formed between lithium (Li) and sulfur (S), we first need to look at the valences of each element.
Lithium has a valence of +1, as it is an alkali metal. Sulfur typically has a valence of -2. To form a neutral compound, we need two lithium ions to balance one sulfur ion:
- 2 Li^+ (from the two lithium atoms) = +2 charge
- 1 S^2- (from one sulfur atom) = -2 charge
Thus, the correct empirical formula for the compound is \( \text{Li}_2\text{S} \).
Therefore, the answer is:
A: Li2S
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