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16 April, 10:15

Arrange follwoing substances from lowest to highest lattice energy" MgS, KI, GAN, LiBr

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  1. 16 April, 10:56
    Answer: KI, LiBr, MgS, GaN


    Ionic sizes are the deciding factor in lattice energy. The smaller the ion, the higher the lattice energy. Since K+> Li + and I - is larger than Br-, LiBr will have a higher lattice energy. The size of the sulphide ion is much smaller than the nitride ion but the Gallium is much smaller due to lanthanide contraction hence the answer.
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