Which of the following is not representative element?

Options

A. Tellurium
B. Tantalum
C. Thallium
D. Astatine

Explanation

To determine which of the following elements is not a representative element, we need to understand the classification of elements in the periodic table.

### Step-by-Step Solution:

1. **Understand Representative Elements**:
- Representative elements are those that belong to the s-block and p-block of the periodic table.
- The s-block includes groups 1 and 2, while the p-block includes groups 13 to 18.

2. **Identify the Elements**:
- We need to identify the elements given in the question. Let's assume the elements mentioned are Teruleum, Antelope, Thallium, and Astatine.

3. **Classify Each Element**:
- **Teruleum**: This element belongs to the oxygen family (group 16), which is in the p-block.
- **Antelope**: This element belongs to the d-block (transition metals), which means it is not a representative element.
- **Thallium**: This element belongs to the boron family (group 13), which is in the p-block.
- **Astatine**: This element belongs to the halogen family (group 17), which is also in the p-block.

4. **Determine the Non-Representative Element**:
- From the classifications, we see that Teruleum, Thallium, and Astatine are all representative elements as they belong to the s or p-block.
- Antelope, on the other hand, belongs to the d-block and is therefore not a representative element.

5. **Conclusion**:
- The element that is not a representative element is **Antelope**.

### Final Answer:
Antelope is not a representative element.