Number of groups in d-block

Options

A. 5
B. 10
C. 15
D. 20

Answer

To determine the number of groups in the d-block of the periodic table, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Periodic Table**:
- The periodic table is organized into periods (horizontal rows) and groups (vertical columns).
- Groups are numbered from 1 to 18.

2. **Identify the Blocks**:
- The periodic table is divided into four blocks based on the electron configuration: s-block, p-block, d-block, and f-block.
- The d-block elements are those whose outermost electrons are in the d-orbital.

3. **Locate the d-block in the Periodic Table**:
- The d-block elements are found in groups 3 to 12 of the periodic table.
- This means the d-block spans across these groups.

4. **Count the Groups in the d-block**:
- The groups that correspond to the d-block elements are:
- Group 3
- Group 4
- Group 5
- Group 6
- Group 7
- Group 8
- Group 9
- Group 10
- Group 11
- Group 12
- Therefore, there are a total of 10 groups in the d-block.

5. **Conclusion**:
- The number of groups in the d-block is 10.

### Final Answer:
The number of groups in the d-block is **10**.

---