What are representative elements?

Options

A. s-block
B. s-block and p-block
C. d-block or transition elements
D. d-block and f-block

Answer

### Step-by-Step Solution:

1. **Definition of Representative Elements**:
- Representative elements are defined as the elements that are found in both the S block and P block of the periodic table.

2. **Identification of S Block Elements**:
- The S block elements include those in Group 1 (alkali metals) and Group 2 (alkaline earth metals) of the periodic table.

3. **Identification of P Block Elements**:
- The P block elements include those in Group 13 through Group 18 of the periodic table, which encompasses a variety of nonmetals, metalloids, and metals.

4. **Combining S Block and P Block**:
- Therefore, the representative elements consist of all elements from Group 1 and Group 2 (S block) and all elements from Group 13 to Group 18 (P block).

5. **Conclusion**:
- In summary, the representative elements are the combination of S block and P block elements, which are crucial for understanding the periodic trends and chemical properties of these elements.