\( \mathrm{CaO} \) and \( \mathrm{NaCl} \) have the same crystal st...

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\( \mathrm{CaO} \) and \( \mathrm{NaCl} \) have the same crystal structure
P and approximately the same ionic radii. If \( \mathrm{U} \) is

W the lattice energy of \( \mathrm{NaCl} \), the approximate lattice energy of \( \mathrm{CaO} \) is
(1) \( \mathrm{U} / 2 \)
(2) \( \mathrm{U} \)
(3) \( 2 \mathrm{U} \)
(4) \( 4 \mathrm{U} \)
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