Question

An ionic crystal lattice has r+ /r- radius ratio of 0.524 its co-ordinate no is

Answer 1

An ionic crystal lattice has = r+/r-radius of 0.524 .
coordinate no. =?
So I can't know answer

Answer 2

Answer : The coordination number is, 6 and the type of void is octahedral.

Explanation :

Cation-anion radius ratio : It is defined as the ratio of the ionic radius of the cation to the ionic radius of the anion in a cation-anion compound.

This is represented by, $\frac{r_{cation}}{r_{anion}}$

When the radius ratio is greater than 0.155, then the compound will be stable.

As per question, the radius of cation-anion ratio is between 0.414-0.732. So, the coordination number is, 6.

The relation between radius ratio and coordination number are shown below.

Therefore, the coordination number is, 6 and the type of void is octahedral.