The compound Li2S is named lithium sulfide. This compound is formed by the reaction of lithium, which is an alkali metal, and sulfur, a non-metal.
In lithium sulfide, two lithium ions (Li+) combine with one sulfide ion (S2-) to form the neutral compound. The lithium ions each have a +1 charge, while the sulfide ion has a -2 charge. Therefore, two lithium ions are needed to balance the charge of one sulfide ion.
Lithium sulfide is typically found as a white solid and is used in various applications, including in batteries and as a precursor for other lithium compounds.