Observing the value of lattice energy of compounds NaI to NaBr to NaCl, all are in the range from -700 to -800 kJ/mol. Then why is it that the lattice energy of NaF (-926 kJ/mol) is much more negative than those of the other sodium halides?

Compound

LiF -1037

LiCl -852

LiBr -815

LiI -761

NaF -926

NaCl -786

NaBr -752

NaI -702

KF -821

KCl -717

KBr -689

KI -649

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Matt OcampoLv10

15 Dec 2020

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Examine the trends in lattice energy in Table 12.1. The value of the lattice energy becomes somewhat more negative on going from NaI to NaBr to NaCl, and all are in the range from -700 to -800 kJ/mol. Suggest a reason for the observation that the lattice energy of NaF (∆latticeU = -926 kJ/mol) is much more negative than those of the other sodium halides.

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Examine the trends in lattice energy in Table 12.1. The value of the lattice energy becomes somewhat more negative on going from NaI to NaBr to NaCl, and all are in the range from −700 to −800 kJ/mol. Suggest a reason for the observation that the lattice energy of NaF (Δ_lattice U = −926 kJ/mol) is much more negative than those of the other sodium halides.

TABLE 12.1

Lattice Energies of Some Ionic Compounds

lavenderfish593

Examine the trends in lattice energy in the Table below. The value of the lattice energy becomes somewhat more negative on going from NaI to NaBr to NaCl, and all are in the range from −700 to −800 kJ/mol. Suggest a reason for the observation that the lattice energy of NaF (Δ_lattice U = −926 kJ/mol) is much more negative than those of the other sodium halides.

Why lattice energy is much more negative than those of the other sodium halides.