Chemistry

Problem

The sums of the ionic radii for two salts are 231 pm for NaF and 314 pm for KCl. The cations and anions in both salts carry charges of

+1

and

-1

, respectively. What is the predicted ratio

\dfrac{|E_{\text{NaF}}|}{|E_{\text{KCl}}|}

of their lattice energies based on these data? a)

0.74

1.85

1.36

1.00