If two elements of p-block have difference of group number = 4, then difference of their valence shell electrons will not be 

Options

A. 2
B. 3
C. 4
D. 6

Answer

To solve the problem, we need to analyze the relationship between the group number of p-block elements and their valence shell electrons.

### Step-by-Step Solution:

1. **Identify the Group Numbers**:
- The p-block elements are located in groups 13 to 18 of the periodic table.
- If we take two elements from the p-block that have a difference of 4 in their group numbers, we can denote them as Group X and Group (X + 4).

2. **Determine the Group Numbers**:
- Let's consider Group 13 (X = 13) and Group 17 (X + 4 = 17) as an example.
- Alternatively, we could also consider Group 14 (X = 14) and Group 18 (X + 4 = 18).

3. **Count Valence Electrons**:
- The number of valence electrons for each group is as follows:
- Group 13: 3 valence electrons
- Group 14: 4 valence electrons
- Group 15: 5 valence electrons
- Group 16: 6 valence electrons
- Group 17: 7 valence electrons
- Group 18: 8 valence electrons

4. **Calculate the Difference in Valence Electrons**:
- For Group 13 (3 electrons) and Group 17 (7 electrons), the difference in valence electrons is:
- 7 - 3 = 4
- For Group 14 (4 electrons) and Group 18 (8 electrons), the difference in valence electrons is:
- 8 - 4 = 4

5. **Conclusion**:
- In both cases, the difference in the number of valence electrons is 4.
- Therefore, if two elements of the p-block have a difference of group number = 4, the difference in their valence shell electrons will be 4.

### Final Answer:
The difference of their valence shell electrons will not be **2** or **0**.