The correct statement about lithium sulfide is: The atoms in lithium sulfide are held together by bonds.
Here’s a brief explanation for why the other options are incorrect:
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The chemical formula for lithium sulfide is Li₂S, not LiS. It consists of two lithium (Li) atoms and one sulfur (S) atom.
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A molecular model of lithium sulfide would actually have three spheres – two representing lithium atoms and one representing the sulfur atom.
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In lithium sulfide, lithium (Li) forms positive ions (Li⁺), while sulfur (S) typically forms negative ions (S²⁻). So, sulfur does not form a positive ion in this context.