Concept explainers
Interpretation:
This is to be explained how lattice energy is a negative quantity.
Concept introduction:
Delocalized electrons are not present on a single atom or in a covalent bond. One electron pair is called delocalized if it is free to move from one atom to other in a molecule or compound.

Answer to Problem 121A
An amount of energy that equals in magnitude but opposite in charge is released when ionic compounds form a crystal lattice. Thus, to form 1 mole of ionic solid, the lattice energy is negative.
Explanation of Solution
The energy required to separate 1 mole of ions of an ionic compound is lattice energy. An amount of energy that equals in magnitude but opposite in charge is released when ionic compounds form a crystal lattice. Thus, to form 1 mole ionic solid, lattice energy is negative and to break 1 mole ionic solid, lattice energy is positive.
An amount of energy that equals in magnitude but opposite in charge is released when ionic compounds form a crystal lattice. Thus, to break 1 mole ionic solid, lattice energy is positive.
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