Question

An ionic compound is expected to have tetrahedral structure if $\frac{r_{+}}{r_{-}}$ lies in the range of:

• A. $0.414$ to $0.732$
• B. $0.225$ to $0.414$
• C. $0.155$ to $0.225$
• D. $0.732$ to $1$

Answer 1

The correct option is B $0.225$ to $0.414$

An ionic compound is expected to have tetrahedral structure if $\frac{r_{+}}{r_{-}}$ lies in the range of 0.225 to 0.414. The range 0.414 to 0.732 corresponds to octahedral geometry. The range 0.155 to 0.225 corresponds to tringular planar geometry. The range > 0.732 corresponds to radius of a cubic void.

Option B is correct.