Problem: Periodic trends in lattice energy as a function of cation or anion radius.Using this figure, can you place an upper and lower limit on the lattice energy of KF?

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We use the following equation to estimate the lattice energy of ionic compounds:

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Problem Details


Two bar charts are shown, each showing lattice energy (kilojoules per mole).  The first shows increasing cation radius and is summarized as follows; cation radius increases with each description. Cation LiCl (smallest) has a lattice energy of 834 kJ/mole, cation NaCl has a lattice energy of 788 kJ/mole, cation KCl has a lattice energy of 701 kJ/mole, cation RbCl has a lattice energy of 691 kJ/mole, and cation CsCl (largest) has a lattice energy of 657 kJ/mole. The second table shows increasing anion radius and is summarized as follows; anion radius increases with each description. Anion NaF (smallest) has a lattice energy of 910 kJ/mole, anion NaCl has a lattice energy of 788 kJ/mole, anion NaBr has a lattice energy of 732 kJ/mole, and anion NaI (largest) has a lattice energy of 682 kJ/mole.

Periodic trends in lattice energy as a function of cation or anion radius.


Using this figure, can you place an upper and lower limit on the lattice energy of KF?

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