Structure of Ionic Solids

AP Chemistry· difficulty 4/5

Which compound has the LARGEST (most exothermic) lattice energy?

  • A

    MgCl2_2

  • B

    MgO

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  • C

    NaF

  • D

    NaCl

Explanation

Lattice energy ∝ q+q/r|q_+ q_-|/r. MgO: charges ±2\pm 2, small ions → very large. MgO has the largest magnitude.

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