Which of the following d-block elements has `d^(10)` configuration ?

Options

A. `Cu, Ag, An`
B. `Zn, Cd, Hg`
C. `Fe, Co, Ni`
D. `Ru, Rh, Pd`

Answer

To determine which of the given d-block elements has a d^10 electron configuration, we can analyze the electron configurations of the elements mentioned in the question.

### Step-by-Step Solution:

1. **Identify the Elements**: The question mentions several d-block elements. For this solution, we will consider the elements: Copper (Cu), Silver (Ag), Gold (Au), Zinc (Zn), Cadmium (Cd), Mercury (Hg), Iron (Fe), Cobalt (Co), Nickel (Ni), Palladium (Pd), Rhodium (Rh), and Ruthenium (Ru).

2. **Write the Electron Configurations**:
- **Copper (Cu)**: The electron configuration is [Ar] 3d^10 4s^1. (d^10 configuration is present but not fully occupied in the outer shell)
- **Silver (Ag)**: The electron configuration is [Kr] 4d^10 5s^1. (d^10 configuration is present but not fully occupied in the outer shell)
- **Gold (Au)**: The electron configuration is [Xe] 5d^10 6s^1. (d^10 configuration is present but not fully occupied in the outer shell)
- **Zinc (Zn)**: The electron configuration is [Ar] 3d^10 4s^2. (d^10 configuration is fully occupied)
- **Cadmium (Cd)**: The electron configuration is [Kr] 4d^10 5s^2. (d^10 configuration is fully occupied)
- **Mercury (Hg)**: The electron configuration is [Xe] 5d^10 6s^2. (d^10 configuration is fully occupied)
- **Iron (Fe)**: The electron configuration is [Ar] 3d^6 4s^2. (not d^10)
- **Cobalt (Co)**: The electron configuration is [Ar] 3d^7 4s^2. (not d^10)
- **Nickel (Ni)**: The electron configuration is [Ar] 3d^8 4s^2. (not d^10)
- **Palladium (Pd)**: The electron configuration is [Kr] 4d^10. (d^10 configuration is present)
- **Rhodium (Rh)**: The electron configuration is [Kr] 4d^7 5s^2. (not d^10)
- **Ruthenium (Ru)**: The electron configuration is [Kr] 4d^7 5s^2. (not d^10)

3. **Identify the Elements with d^10 Configuration**:
- From the configurations, we see that:
- **Zinc (Zn)**: 3d^10 4s^2
- **Cadmium (Cd)**: 4d^10 5s^2
- **Mercury (Hg)**: 5d^10 6s^2
- **Palladium (Pd)**: 4d^10

4. **Conclusion**: The elements that have a d^10 configuration are **Zinc (Zn)**, **Cadmium (Cd)**, **Mercury (Hg)**, and **Palladium (Pd)**.

### Final Answer:
The d-block elements that have a d^10 configuration are **Zinc (Zn)**, **Cadmium (Cd)**, **Mercury (Hg)**, and **Palladium (Pd)**.