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Interpretation: The trend for a given halogen in which the effect on lattice energy is to be stated as the atomic radius of the alkali metal increases.
Concept Introduction : Lattice energy is the amount of energy released when 1 mole of a solid ionic compound is converted to gaseous ionic constituents. It is different for different ionic compounds.
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Answer to Problem 11STP
As the atomic radius of alkali metals increases, the lattice energy for alkali metals decreases.
Explanation of Solution
The atomic radius of alkali increases from Li to Cs. In the given graph, the atomic radius of alkali metal increases (downward); the lattice energy for the given halogen decreases.
For example, the lattice energy for Li with F is greater than the lattice energy for Na with F, atomic size of Na is greater than Li. But the lattice energy decreases as the size of the metal increases.
Hence, the atomic radius of alkali metals increases, and the lattice energy for alkali metals decreases.
Chapter 7 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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