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Structure of Ionic Solids

AP Chemistry· difficulty 4/5

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

  • A

    MgOMgO

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  • B

    CaF2CaF_2

  • C

    NaClNaCl

  • D

    KBrKBr

Explanation

Lattice energy ∝∣q+q−∣/r\propto |q_+ q_-|/r. MgO: ∣2×2∣|2\times 2| = 4 with small ions. NaCl: ∣1×1∣|1\times 1| = 1. CaF2_2: ∣2×1∣|2\times 1| = 2. KBr: ∣1×1∣|1\times 1| = 1, large ions. MgO highest by far.

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