Which is true about the electronegative order of the following elements ?

Options

A. `P gt Si`
B. `C gt N`
C. `Br gt Cl`
D. `Sr gt Ga`

Explanation

To determine the correct order of electronegativity among the given elements, we need to understand the trends in electronegativity across periods and down groups in the periodic table. Here’s a step-by-step solution:

### Step 1: Understand Electronegativity Trends
Electronegativity is the ability of an atom to attract electrons in a chemical bond. The general trends are:
- **Across a Period (Left to Right)**: Electronegativity increases because the atomic size decreases and the effective nuclear charge increases.
- **Down a Group (Top to Bottom)**: Electronegativity decreases because the atomic size increases, making it harder for the nucleus to attract bonding electrons.

### Step 2: Analyze the Given Elements
We will analyze the electronegativity of the following pairs of elements based on their positions in the periodic table:
1. **Phosphorus (P) and Silicon (Si)**
2. **Carbon (C) and Nitrogen (N)**
3. **Bromine (Br) and Chlorine (Cl)**
4. **Strontium (Sr) and Gallium (Ga)**

### Step 3: Compare Electronegativity of Each Pair
1. **Phosphorus (P) vs. Silicon (Si)**:
- Silicon is to the left of phosphorus in the periodic table.
- Therefore, P > Si (Phosphorus is more electronegative than Silicon).

2. **Carbon (C) vs. Nitrogen (N)**:
- Nitrogen is to the right of carbon in the periodic table.
- Therefore, N > C (Nitrogen is more electronegative than Carbon).

3. **Bromine (Br) vs. Chlorine (Cl)**:
- Chlorine is above bromine in the periodic table.
- Therefore, Cl > Br (Chlorine is more electronegative than Bromine).

4. **Strontium (Sr) vs. Gallium (Ga)**:
- Gallium is to the right of strontium in the periodic table.
- Therefore, Ga > Sr (Gallium is more electronegative than Strontium).

### Step 4: Conclusion
Based on the analysis, the correct order of electronegativity for the pairs is:
- P > Si
- N > C
- Cl > Br
- Ga > Sr

Thus, the only correct statement regarding electronegativity is that phosphorus is more electronegative than silicon.

### Final Answer
The correct order of electronegativity is:
- **Phosphorus (P) > Silicon (Si)**