The correct statement about lithium sulfide is:
The atoms in lithium sulfide are held together by bonds.
Here's a brief explanation for why this is the correct choice and why the others are not:
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The atoms in lithium sulfide are held together by bonds. - This is true; lithium sulfide (Li₂S) consists of lithium and sulfur atoms that are held together by ionic bonds.
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A molecular model of lithium sulfide would have two spheres. - This is not entirely accurate. A more representative model would include more than just two spheres because it should depict the two lithium atoms and one sulfur atom, which would require at least three spheres.
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Both lithium and sulfur form positive ions. - This statement is false. Lithium does form positive ions (Li⁺), but sulfur typically forms negative ions (S²⁻) in this compound.
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The chemical formula for lithium sulfide is LiS2. - This is incorrect. The correct formula for lithium sulfide is Li₂S.
Therefore, the first statement is the correct response.