The number of electrons present in 3d of `Cu^(o+)` is

Options

A. 20
B. 10
C. 16
D. 24

Answer

To determine the number of electrons present in the 3d subshell of the copper ion \( Cu^{+} \), we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Atomic Number of Copper**:
- The atomic number of copper (Cu) is 29. This means a neutral copper atom has 29 electrons.

2. **Write the Electronic Configuration of Neutral Copper**:
- The electronic configuration of copper is:
\[ 1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^6 \, 3d^{10} \, 4s^1 \]
- Here, we see that the 3d subshell has 10 electrons.

3. **Determine the Configuration for the Copper Ion \( Cu^{+} \)**:
- The \( Cu^{+} \) ion means that copper has lost one electron. The electron is typically removed from the outermost shell first, which is the 4s subshell in this case.
- Therefore, the electronic configuration for \( Cu^{+} \) becomes:
\[ 1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^6 \, 3d^{10} \, 4s^0 \]

4. **Count the Electrons in the 3d Subshell**:
- In the configuration of \( Cu^{+} \), the 3d subshell still contains 10 electrons.

5. **Conclusion**:
- The number of electrons present in the 3d subshell of \( Cu^{+} \) is **10**.

### Final Answer:
The number of electrons present in the 3d subshell of \( Cu^{+} \) is **10**.

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