In a close packed structure, the atoms stack together occupying maximum space and leaving minimum vacant space. The close packing arrangment may be hcp (ABABA….) or ccp (ABCABCA….). In these arrangments, there is one octahedral void and two tetrahedral voids. Depending upon the ratio of size of cation and anion, the ions of one type occupy the voids of other ions. This results in different types of crystalline structures.
Predict the coordination number of `Cs^(+)` ion and structure of CsCl , if radii of `Cs^(+) and Cl^(-)` ions are `1.69 Å and 1.81 Å` respectively.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Determine the radius ratio of Cs⁺ to Cl⁻
We are given the radii of the ions:
- Radius of Cs⁺ = 1.69 Å
- Radius of Cl⁻ = 1.81 Å

To find the radius ratio, we divide the radius of Cs⁺ by the radius of Cl⁻:
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