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lattice energy

noun
1.
(chem) the energy required to separate the ions of a crystal to an infinite distance, usually expressed in joules per mole
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Encyclopedia Article for lattice energy

the energy needed to completely separate an ionic solid, such as common table salt, into gaseous ions (also the energy released in the reverse process). Lattice energy is usually measured in kilojoules per mole (1 mole = 6.0221367 1023). For each particular solid, the lattice energy is a constant that measures how tightly the constituent particles are held together. The lattice energy can be calculated if the arrangement and spacing of the particles are known. Typical values for lattice energies of ionic solids at room temperature are roughly 700 to 1,000 kilojoules per mole

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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