The correct statement about lithium sulfide is:
The atoms in lithium sulfide are held together by bonds.
Here's a brief explanation for the other options:
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Both lithium and sulfur form positive ions. - This statement is incorrect. While lithium forms positive ions (Li⁺), sulfur typically forms negative ions (S²⁻).
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The chemical formula for lithium sulfide is LiS2. - This statement is incorrect. The correct formula for lithium sulfide is Li₂S, indicating two lithium ions for every one sulfide ion.
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A molecular model of lithium sulfide would have two spheres. - This statement is misleading. While there are two lithium ions in the formula, the compound is ionic rather than molecular, forming a lattice structure rather than discrete molecules.
Therefore, the second option about the bonds holding the atoms together best describes the nature of lithium sulfide.