Final answer:
The lattice energy of a compound is determined by the ionic charges and ion sizes. In this case, MgO has the highest lattice energy, followed by LiF, Li₂O, and MgO.
Step-by-step explanation:
The lattice energy of a compound is determined by factors such as the ionic charges of the ions and the distance between them. Generally, compounds with higher ionic charges and smaller ion sizes will have higher lattice energies.
- In this case, MgO has the highest lattice energy as it has the highest ionic charge (Mg²+ and O²-) compared to MgSe (Mg²+ and Se²-).
- LiF has a higher lattice energy than MgO because Li⁺ and F⁻ ions are smaller and have higher charges than Mg²+ and O²- ions.
- Lithium oxide (Li₂O) has a higher lattice energy than lithium chloride (LiCl) because Li⁺ ions in Li₂O have higher charge compared to Li⁺ in LiCl.
- MgO has a higher lattice energy than Li₂Se because Mg²+ and O²- ions have higher charges compared to Li⁺ and Se²- ions.