Which one of the following statements related to the modern periodic table is incorrect?

Options

A. The p-block has 6 column because a maximum of 6 electrons can occupy all the orbitals in the p - subshell
B. The d-block has 8 columns because a maximum of 8 electrons can occupy all the orbitals in the d - subshell
C. Each block contains a number of columns equal to number of electrons that can occupy the subshell
D. The block indicates the value of azimuthal quantum number for the last subshell which received electrons

Answer

To determine which statement related to the modern periodic table is incorrect, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement A**: "P block has six columns because a maximum of six electrons can occupy all the orbitals in the p subshell."
- **Analysis**: The p subshell indeed has three orbitals (px, py, pz), and each orbital can hold a maximum of 2 electrons. Therefore, the total number of electrons that can occupy the p subshell is 3 orbitals × 2 electrons/orbital = 6 electrons. This means there are 6 columns in the p block of the periodic table.
- **Conclusion**: This statement is **correct**.

2. **Statement B**: "D block has 8 columns because a maximum of 8 electrons can occupy all the orbitals."
- **Analysis**: The d subshell has five orbitals, and each can hold a maximum of 2 electrons. Thus, the total number of electrons that can occupy the d subshell is 5 orbitals × 2 electrons/orbital = 10 electrons. Therefore, there are 10 columns in the d block of the periodic table, not 8.
- **Conclusion**: This statement is **incorrect**.

3. **Statement C**: "Each block contains a number of columns equal to the number of electrons that occupy this subshell."
- **Analysis**: This is true for each block:
- S block: 2 electrons → 2 columns
- P block: 6 electrons → 6 columns
- D block: 10 electrons → 10 columns
- F block: 14 electrons → 14 columns
- **Conclusion**: This statement is **correct**.

4. **Statement D**: "The block indicates the value of the azimuthal quantum number for the last subshell which received electrons."
- **Analysis**: The azimuthal quantum number (l) corresponds to the subshells as follows:
- S subshell (l=0) → S block
- P subshell (l=1) → P block
- D subshell (l=2) → D block
- F subshell (l=3) → F block
- This statement is also true.
- **Conclusion**: This statement is **correct**.

### Final Conclusion:
The incorrect statement is **Statement B**.