The correct statement about lithium sulfide is:
The atoms in lithium sulfide are held together by bonds.
In lithium sulfide (Li2S), lithium (Li) donates electrons to sulfur (S), resulting in the formation of ionic bonds. Thus, this statement accurately describes the nature of the interaction between the atoms in the molecule.
The other statements are incorrect:
- The chemical formula for lithium sulfide is not LiS2; it is Li2S.
- Lithium forms positive ions (Li⁺), but sulfur typically forms negative ions (S²⁻), not positive ions.
- A molecular model of lithium sulfide would actually have three spheres (two for lithium and one for sulfur), not two.
Thus, the correct answer is that the atoms in lithium sulfide are held together by bonds.