The correct statement about lithium sulfide is: The atoms in lithium sulfide are held together by bonds.
Here are explanations for each of the options provided:
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A molecular model of lithium sulfide would have two spheres. - This is incorrect because it would actually have three spheres representing the two lithium atoms and one sulfur atom.
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The atoms in lithium sulfide are held together by bonds. - This is correct. In lithium sulfide (Li2S), lithium (Li) atoms donate electrons to sulfur (S), forming ionic bonds.
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Both lithium and sulfur form positive ions. - This is incorrect. Lithium forms positive ions (Li⁺), but sulfur typically forms negative ions (S²⁻) by gaining electrons.
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The chemical formula for lithium sulfide is LiS2. - This is incorrect. The correct formula is Li2S, indicating two lithium ions for every sulfur ion.
Thus, the most accurate statement is about the bonds holding the atoms together.