Question

The values of two lattice energies are given below:
$NaF -915 kJ mol ^{-1} ; MgO -3933 kJ mol ^{-1}$
Which of the following correct statements help to explain the difference between these two values?

• A. In each of these compounds, the ions are isoelectronic
• B. The attraction between doubly charged ions is about four times than that between singly charged ions
• C. The interionic distance in $NaF$ is greater than that in $MgO$
• D. The interionic distance in $NaF$ is smaller than that in $MgO$

Answer 1

Answer: (B), (C)

Higher magnitude of charge and smaller interionic radius of $MgO$ are responsible for higher lattice energy.