Which of the following ions has a pseudo-inert-gas configuration?

Options

A. `Zn^(2+)`
B. `Cu^(+)`
C. `Ag^(+)`
D. All of these

Explanation

To determine which of the given ions has a pseudo-inert gas configuration, we need to understand what a pseudo-inert gas configuration is. A pseudo-inert gas configuration is a stable electronic configuration that resembles that of a noble gas but does not have a complete octet. Instead, it typically has a filled d-subshell.

Let's analyze the ions one by one:

1. **Zinc ion (Zn²⁺)**:
- The atomic number of zinc (Zn) is 30.
- The electronic configuration of neutral zinc is:
\[ \text{Zn: } [\text{Ar}] 3d^{10} 4s^2 \]
- When zinc loses two electrons to form Zn²⁺, it loses the two 4s electrons:
\[ \text{Zn}^{2+}: [\text{Ar}] 3d^{10} \]
- This configuration has a filled d-subshell.

2. **Copper ion (Cu⁺)**:
- The atomic number of copper (Cu) is 29.
- The electronic configuration of neutral copper is:
\[ \text{Cu: } [\text{Ar}] 3d^{10} 4s^1 \]
- When copper loses one electron to form Cu⁺, it loses the 4s electron:
\[ \text{Cu}^+: [\text{Ar}] 3d^{10} \]
- This configuration also has a filled d-subshell.

3. **Silver ion (Ag⁺)**:
- The atomic number of silver (Ag) is 47.
- The electronic configuration of neutral silver is:
\[ \text{Ag: } [\text{Kr}] 4d^{10} 5s^1 \]
- When silver loses one electron to form Ag⁺, it loses the 5s electron:
\[ \text{Ag}^+: [\text{Kr}] 4d^{10} \]
- This configuration has a filled d-subshell.

Now, we can conclude that all three ions (Zn²⁺, Cu⁺, and Ag⁺) have a pseudo-inert gas configuration because they all have a filled d-subshell. However, if we are looking for the most common examples of pseudo-inert gas configurations, Zn²⁺ and Cu⁺ are typically highlighted.

**Final Answer**: Zn²⁺, Cu⁺, and Ag⁺ all have a pseudo-inert gas configuration.