Find out total number of representative elements in the given element:
Cd, Nb, Ta, Te, Ra, Mo, Po, Pd, Tc

Explanation

To find the total number of representative elements from the given list of elements, we need to identify which of these elements belong to the s-block and p-block of the periodic table, as these are classified as representative elements.

### Step-by-step Solution:

1. **List the Given Elements**:
The elements provided are:
- Cd (Cadmium)
- Nb (Niobium)
- Ta (Tantalum)
- Te (Tellurium)
- Ra (Radium)
- Mo (Molybdenum)
- Po (Polonium)
- Pd (Palladium)
- Tc (Technetium)

2. **Identify the Block of Each Element**:
- **Cd (Cadmium)**: d-block
- **Nb (Niobium)**: d-block
- **Ta (Tantalum)**: d-block
- **Te (Tellurium)**: p-block
- **Ra (Radium)**: s-block
- **Mo (Molybdenum)**: d-block
- **Po (Polonium)**: p-block
- **Pd (Palladium)**: d-block
- **Tc (Technetium)**: d-block

3. **Determine the Representative Elements**:
Representative elements are those found in the s-block and p-block. From our identification:
- **s-block**: Ra (Radium)
- **p-block**: Te (Tellurium), Po (Polonium)

4. **Count the Representative Elements**:
The representative elements identified are:
- Ra (Radium)
- Te (Tellurium)
- Po (Polonium)

Therefore, the total number of representative elements is **3**.

### Final Answer:
The total number of representative elements in the given list is **3**.

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