The ionic radii of and are and respectively. Based on the limiting radius ratio rule, what is the mo — Solid State Chemistry Question
Question
The ionic radii of $Rb^+$ and $I^-$ are $1.46\text{ \AA}$ and $2.16\text{ \AA}$ respectively. Based on the limiting radius ratio rule, what is the most probable type of crystal structure exhibited by $RbI$?
Answer: C
💡 Solution & Explanation
The radius ratio is $\frac{r_+}{r_-} = \frac{1.46}{2.16} \approx 0.676$. This ratio lies in the octahedral range ($0.414$ to $0.732$), indicating a coordination number of $6:6$. This matches the standard Rock Salt ($NaCl$) structure.
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