The correct order of electronegativity on Pauling scale is:

Options

A. `F gt CI gt O gt S`
B. `Li gt Na gt L gt Rb gt Cs`
C. `Be lt B lt N lt C`
D. Both `(A)` and `(B)`

Explanation

To solve the question regarding the correct order of electronegativity on the Pauling scale, we will follow these steps:

### Step 1: Understand Electronegativity Trends
Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. On the Pauling scale, electronegativity generally follows two main trends:
- **Down a Group**: Electronegativity decreases as you move down a group in the periodic table. This is because the atomic size increases, and the effective nuclear charge felt by the valence electrons decreases.
- **Across a Period**: Electronegativity increases as you move from left to right across a period. This is due to the increasing nuclear charge, which attracts the bonding electrons more strongly.

### Step 2: Analyze the Given Elements
The elements mentioned in the question are:
- Lithium (Li)
- Sodium (Na)
- Potassium (K)
- Cesium (Cs)

These elements are all in Group 1 (alkali metals). According to the trend we established:
- **Lithium** is at the top of the group, so it has the highest electronegativity.
- **Sodium** is below lithium, so it has a lower electronegativity than lithium.
- **Potassium** is below sodium, so it has a lower electronegativity than sodium.
- **Cesium** is at the bottom of the group, so it has the lowest electronegativity.

### Step 3: Establish the Correct Order
Based on the trends:
- Li > Na > K > Cs

### Step 4: Select the Correct Option
From the options provided, we need to identify which one matches the order we determined. The correct order of electronegativity on the Pauling scale is:
- **Li > Na > K > Cs**

### Conclusion
The correct answer is option B, where the order of electronegativity is:
- Lithium (Li) > Sodium (Na) > Potassium (K) > Cesium (Cs).