Question

Which of the following compounds has the lowest anion to cation size ratio?

• A. $LiF$
• B. $NaF$
• C. $CsI$
• D. $CsF$

Answer 1

The correct option is D $CsF$

For ratio of anion size to cation size to be lowest anion should be smallest $\left(F^{-}\right)$ and cation to be biggest $\left(C{s}^{+}\right)$.