Chem Help about lattice energy?

Using a periodic table, arrange the following substances according to their expected lattice energies, listing them from lowest lattice energy to the highest: MgS, KI, GaN, LiBr

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  • A.S.
    Lv 7
    8 years ago
    Favorite Answer

    (lowest) KI < LiBr < MgS < GaN (highest)

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  • Anonymous
    6 years ago

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    Chem Help about lattice energy?

    Using a periodic table, arrange the following substances according to their expected lattice energies, listing them from lowest lattice energy to the highest: MgS, KI, GaN, LiBr

  • Gail
    Lv 4
    5 years ago

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    Two factors that influence lattice energy (the amount of energy it takes to tear apart an ionic compound lattice into ions) include (1) the charge of the ions ... the larger the charge, the greater the attractive force between the ions (the force is proportional to the charge squared), and (2) the distance between the ionic nuclei ... the smaller the distance, the greater the attractive force. Based on charge, you would expect the compounds with +1 ions (KCl and RbBr) to have smaller lattice energies than the compounds with +2 ions (CaO and SrO). Between NaCl and RbBr, the Na+ and Cl- ions are much smaller than the Rb+ and Br- ions (making their nuclei closer), so the lattice energy of NaCl should be higher than RbBr. Between CaO and SrO, Sr2+ is larger than Ca2+, making the distance between the nuclei smallervfor CaO than for SrO. Thus, CaO has the larger lattice energy. CaO > SrO > NaCl > RbBr

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