What forces hold ionic compounds together? b) Ionic compounds are made up of pos

Question

What forces hold ionic compounds together? b) Ionic compounds are made up of positively and negatively charged particle. What is generally true about oppositely7 charged particles as opposed to identically charged articles with respect to their position relative to each other? c) The lattice energy of LiF is 1030 kJ/mol, significantly greater than the lattice energy of Csl, which is 600 kJ/mol. What about LiF leads to it having so much higher a lattice energy than Csl? d) While LiF has a lattice energy of 1030 kJ/mol. MgO has a lattice energy of 3185 kJ/mol. Why is the lattice energy of MgO so much higher than LiF?

Explanation / Answer

a) coulombic attraction forces hold ionic compounds.

b) generally particles with same charge repelled by each other. There is strong coulombic attractions between opposite charges.

c) Lattice energy is directly proportional to charge on ions and inversely proportional to size of ions. So compounds containing smaller ions with greater charge will have greater lattice energy. LiF has smaller ions than CsI so LiF has greater lattice energy than CsI.

d) MgO has ions with +2 and -2 charges where as LiF has ions with +1 and -1 charges. So MgO has greater lattice energy than LiF.

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