The correct statement about lithium sulfide is:
The atoms in lithium sulfide are held together by bonds.
Here's a breakdown of the other options:
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A molecular model of lithium sulfide would have two spheres.: This statement is misleading because a molecular model would actually visually represent the two lithium atoms and one sulfur atom, resulting in three spheres in total (two for lithium and one for sulfur).
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The chemical formula for lithium sulfide is LiS2.: This statement is incorrect. The correct chemical formula for lithium sulfide is Li2S, as there are two lithium atoms and one sulfur atom.
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Both lithium and sulfur form positive ions.: This statement is incorrect. Lithium typically forms a positive ion (Li⁺), but sulfur typically forms a negative ion (S²⁻) in compounds like lithium sulfide.
Thus, the statement that correctly describes lithium sulfide is about the bonds between the atoms.