Question

In a molecule of lithium sulfide are two atoms of lithium in one atom of sulfur which statement about lithium sulfide is correct A The atoms in lithium sulfide are held together by bonds B a molecular model of lithium sulfide would have two spheres C both lithium and sulfur from positive ions D The chemical formula for lithium sulfide is LiS

Answer 1

Let's analyze each of the statements regarding lithium sulfide (Li₂S):

A. **The atoms in lithium sulfide are held together by bonds.**
- This statement is **correct**. In lithium sulfide, lithium and sulfur are held together by ionic bonds, where lithium donates electrons to sulfur.

B. **A molecular model of lithium sulfide would have two spheres.**
- This statement is **incorrect**. Lithium sulfide is an ionic compound, not a molecular compound. Ionic compounds do not form discrete molecules but rather a lattice structure.

C. **Both lithium and sulfur form positive ions.**
- This statement is **incorrect**. In lithium sulfide, lithium (Li) forms a positive ion (Li⁺) whereas sulfur (S) forms a negative ion (S²⁻). So, only lithium forms positive ions.

D. **The chemical formula for lithium sulfide is LiS.**
- This statement is **incorrect**. The correct chemical formula for lithium sulfide, which consists of two lithium ions for each sulfur ion, is Li₂S.

Therefore, the correct statement about lithium sulfide is:
**A. The atoms in lithium sulfide are held together by bonds.**