The electronic configuration of one of the coinage metals is

Options

A. 2, 8, 1
B. 2, 8, 18. 2
C. 2, 8, 18, 1
D. 2, 8, 18

Answer

To determine the electronic configuration of one of the coinage metals, we will focus on the three primary coinage metals: copper (Cu), silver (Ag), and gold (Au). Here’s a step-by-step solution:

### Step 1: Identify the Coinage Metals
The coinage metals are typically considered to be:
- Copper (Cu)
- Silver (Ag)
- Gold (Au)

### Step 2: Find the Atomic Numbers
Next, we need to know the atomic numbers of these metals:
- Copper (Cu) has an atomic number of 29.
- Silver (Ag) has an atomic number of 47.
- Gold (Au) has an atomic number of 79.

### Step 3: Write the Electronic Configurations
Now, we will write the electronic configurations for each of these metals:
1. **Copper (Cu, Atomic Number 29)**:
- The electronic configuration is:
\[ 1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^6 \, 3d^{10} \, 4s^1 \]
- This can also be simplified to:
\[ [Ar] \, 3d^{10} \, 4s^1 \]

2. **Silver (Ag, Atomic Number 47)**:
- The electronic configuration is:
\[ 1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^6 \, 4s^2 \, 3d^{10} \, 4p^6 \, 4d^{10} \, 5s^1 \]
- This can be simplified to:
\[ [Kr] \, 4d^{10} \, 5s^1 \]

3. **Gold (Au, Atomic Number 79)**:
- The electronic configuration is:
\[ 1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^6 \, 4s^2 \, 3d^{10} \, 4p^6 \, 4d^{10} \, 5s^2 \, 5p^6 \, 5d^{10} \, 6s^1 \]
- This can be simplified to:
\[ [Xe] \, 4f^{14} \, 5d^{10} \, 6s^1 \]

### Conclusion
The electronic configuration of one of the coinage metals, specifically copper (Cu), is:
\[ [Ar] \, 3d^{10} \, 4s^1 \]