Which of the following has the highest percentage of ionic character in its bonding?

Options

A. LiI
B. `MgCl_(2)`
C. `CsF`
D. `CsI`

Explanation

To determine which compound has the highest percentage of ionic character in its bonding, we can follow these steps:

### Step 1: Understand Ionic Character
Ionic character in a bond refers to the extent to which the bond exhibits ionic properties. A bond is considered to have high ionic character when it is formed between a large cation and a small anion.

### Step 2: Identify the Cations and Anions
Look at the options provided in the question. Identify the cations (positively charged ions) and anions (negatively charged ions) present in each option.

### Step 3: Compare Sizes of Ions
For ionic bonds, the size of the ions matters:
- A larger cation (positive ion) tends to have a higher ionic character.
- A smaller anion (negative ion) also contributes to higher ionic character.

### Step 4: Analyze the Given Options
Assuming the options include various cations and anions, we need to compare their sizes:
- Identify the largest cation from the options (e.g., cesium, which is known to be one of the largest alkali metal cations).
- Identify the smallest anion from the options (e.g., fluorine, which is one of the smallest anions).

### Step 5: Determine the Highest Ionic Character
Based on the sizes identified:
- The bond formed between the largest cation (cesium) and the smallest anion (fluorine) will exhibit the highest percentage of ionic character.

### Conclusion
Thus, the bond between cesium (Cs) and fluorine (F) possesses the highest percentage of ionic character among the given options.

### Final Answer
The correct option is the bond between cesium and fluorine.

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