The correct statement about lithium sulfide (Li2S) from the given options is:
"The atoms in lithium sulfide are held together by bonds."
Here’s a breakdown of the other options to clarify why they are incorrect:
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A molecular model of lithium sulfide would have two spheres.
- This is somewhat misleading; while it does have two lithium atoms and one sulfur atom, the molecular model also represents them through ionic bonding in the solid state, not just as discrete molecules.
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The chemical formula for lithium sulfide is LiS2.
- This is incorrect; the correct chemical formula for lithium sulfide is Li2S.
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Both lithium and sulfur form positive ions.
- This is incorrect; lithium forms positive ions (Li+), while sulfur typically forms negative ions (S²⁻).
So the most accurate statement among those provided is about the bonding of the atoms.