Which ionic solid has lowest lattice energy?
Correct answer: D. CsCl
- A. LiCI
- B. NaCl
- C. KCI
- D. CsCl
Explanation
The correct answer is D. CsCl. Lattice energy is the energy released when ions in the gas phase come together to form a solid lattice. Lattice energy is inversely proportional to the size of the ions and directly proportional to the charges of the ions. In CsCl, both Cs+ and Cl- ions are larger compared to the ions in LiCl, NaCl, and KCl.
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About Lattice Energy
Lattice energy describes the energy released when gaseous ions form one mole of an ionic solid, or the energy required to separate that solid into gaseous ions, depending on the convention used. Its value depends mainly on ionic charge and radius and is calculated through Born-Haber cycles.
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