Which of the following has lowest lattice energy?
Correct answer: D. CsI
- A. LiF
- B. NaCl
- C. KBr
- D. CsI
Explanation
Lattice energy decreases as the distance between oppositely charged ions increases, while all these salts contain ions with charges of +1 and −1. Cs+ and I− are the largest ion pair listed, so CsI has the weakest electrostatic attraction and the lowest lattice energy. The likely mistake is choosing KBr because it is also relatively large, but CsI has still larger ions.
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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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