Lattice Energy Trend with Charge and Radius
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Lattice energy grows larger as ionic charge increases and as ionic radius decreases, both raising electrostatic attraction between ions.
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Magnesium oxide, built from 2+ and 2− ions, has a far larger lattice energy than sodium chloride's 1+ and 1− ions.
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Charge affects lattice energy more steeply than radius; doubling a charge outweighs a modest radius change.
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