Final answer:
Lattice energy is essential for the stability of ionic compounds, representing the strength of the bonds between ions based on their charges and sizes, affecting their physical properties.
Step-by-step explanation:
The question deals with the concept of lattice energy in ionic compounds, which is a critical factor in determining their stability. Lattice energy is the measure of the strength of the ionic bonds within an ionic compound. It is defined as the energy required to separate one mole of the solid ionic compound into its component gaseous ions.
Lattice energy depends on the magnitude of the charges on the ions and their size. Generally, higher charges and smaller ionic radii contribute to greater lattice energy. This energy contributes significantly to properties such as melting points and hardness of the ionic compound, and although lattice energy cannot be directly measured, it can be calculated using thermochemical cycles like the Born-Haber cycle.