When an Ionic Compound Melts, the Structure of the Crystal $\lt$

question 69

Multiple Choice

When an ionic compound melts, the structure of the crystal lattice breaks down, and the ions must be able to slip past each other.Using electrostatic potential energy as a guide, which listing of ionic compounds is in order of increasing melting point?

• A)AlF₃\(\lt\)MgF₂ \(\lt\)NaF
• B)MgF₂ \(\lt\) NaF \(\lt\)AlF₃
• C)NaF \(\lt\) MgF₂ \(\lt\)AlF₃
• D)AlF₃ \(\lt\) NaF \(\lt\)MgF₂
• E)NaF \(\lt\) AlF₃\(\lt\)MgF₂