Structure of Ionic Solids

AP Chemistry· difficulty 4/5

Which compound has the largest (most negative) lattice energy?

A
$KBr$
B
$CsI$
C
$MgO$
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D
$NaCl$

Explanation

Lattice energy \propto |q₁q₂|/r. MgO has highest charges (2+/2-) and small radii \to far larger magnitude than 1+/1- alkali halides.

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