Final answer:
The ionic compound that forms between lithium and sulfur is Li2S, where lithium forms a +1 cation and sulfur forms a -2 anion, resulting in a balanced neutral compound.
Step-by-step explanation:
The ionic compound that forms between lithium and sulfur using the most common charges is Li2S.
Lithium, being in Group 1A of the periodic table, forms a cation with a +1 charge (Li+). Sulfur, on the other hand, typically forms an anion with a -2 charge (S2-) due to its position in Group 6A. When these ions combine to form an ionic compound, the total positive charge must balance the total negative charge.
Using the crisscross method, we take the magnitude of the charge on the sulfur ion (2-) and make it the subscript for lithium, and take the charge on the lithium ion (1+) to make it the subscript for sulfur. However, since the charge on lithium is 1, we do not need to write it. This results in the formula Li2S, where two lithium ions balance one sulfur ion.