The ionic bond between sodium and chloride ion is stronger than that between potassium and chloride ion. Explain.

Explanation

Since the atomic number of `K(Z=19)` is higher than that of Na(Z=11), `K^(+)` ion is larger than `Na^(+) ` ion, the charge density in `Na^(+)` ion is higher than that of `K^(+)` ion. As a consequence, the coulombic forces of attraction between `Na^(+) and Cl^(-)` ions (the lattice energy) is more than that between `K^(+)` and `Cl^(-)` ions. therefore the ionic bond between `Na^(+) and Cl^(-)` ions is stronger than that between `K^(+) and Cl^(-)` ions.