Question

The ionic radii of rb+ and i- are 1.46 and 2.16 respectively, the most probable type of structure exhibited by it is

Answer 1

Answer:The Crystal structure is octahedral.

Explanation:

Ionic radii of the cation =$r_+=1.46$

Ionic radii of the anion =$r_-=2.16$

Radius ratio = $\frac{\text{Radius of the cation}}{\text{Radius of the anion}}$

The radius ratio of the ionic crystal lattice = $\frac{r_+}{r_-}=\frac{1.46}{2.16}=0.675$

The radius ratio given for the crystal lattice is 0.675 which lies in between the range of 0.414 to 0.732 for 6 coordination number. The Crystal structure with 6 coordination number octahedral.