Question

R+:r- of substance is 0.8.the coordination number is

Answer 1

Answer:Cordination Number is 8

Explanation: Refer to the general table formatted after derivations.

Answer 2

Answer:

The coordination number of the substance having a radius ratio of 0.8 is 8.

Explanation:

The ratio of the radius of a cation to that of the anion is called the radius ratio.

$Radius Ratio = \frac{r+}{r-}$

Here r₊ is the radius of the cation and r₋ is the radius of the anion.

The greater the radius ratio, the larger the size of the cation and hence greater, is its coordination number.

The relationship between the radius ratio, coordination number and structural arrangement is called the radius ratio rules.

Radius Ratio Coordination number Structural Arrangement

0.155-0.225            3                                 Planar triangular

0.225-0.414               4                                 Tetrahedral

0.414-0.732            6                                 Octahedral

0.732-1.00            8                                 Body-centred cubic