Answer:
The correct answer is C.
Explanation:
The compound with the highest melting point according to the ion bond model is the one with the greatest electronegativity difference, since the ion bond is stronger and therefore more difficult to break.
The electronegativity difference is calculated as the electronegativity difference of the atoms of the molecule.
AlN: Al (1,61) and N (3,04) so the difference gives 1,43.
MgO: Mg (1,31) and O (3,44) so the difference gives 2,13.
NaF: Na (0,93) and F (3,98) so the difference gives 3,05.
CaS: Ca (1) and S (2,58) so the difference is 1,58.
RbI: Rb (0.82) and I (2.66) so the difference is 1.84.
Analyzing the different cases, we can conclude that the molecule that presents the greatest difference in electronegativity is NaF, so it will have a higher boiling point due to the attraction force between its atoms.
Have a nice day!
Based on the ionic bonding model, AlN has the highest melting point.
According to the ionic bonding model, the smaller the size of the ions, the higher the lattice of the ionic crystal. The higher the lattice energy, the greater the magnitude of ionic interaction between ions in the crystal.
Looking at the options, we can see that Al^3+ and N^3- are the smallest ions hence the compound AlN will have the highest lattice energy and consequently the highest melting point among the compounds in the list.
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