(C) The melting point of ionic halides depends on the lattice energy of the crystal. According to Fajan's rule,as the size of the anion increases $(F^

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(C) The melting point of ionic halides depends on the lattice energy of the crystal. According to Fajan's rule,as the size of the anion increases $(F^- $NaF$ has the smallest anion,which results in the highest lattice energy and the strongest ionic character among the given options. Therefore,$NaF$ has the highest melting point.