`(n-1)d^(10)ns^(2)`is the electronic configuration of

Options

A. Fe, Co, Ni
B. Cu Ag, Au
C. Zn, Cd, Hg
D. Se, Y, La

Answer

To determine which element corresponds to the electronic configuration `(n-1)d^(10)ns^(2)`, we can follow these steps:

### Step 1: Understand the Electronic Configuration
The given electronic configuration `(n-1)d^(10)ns^(2)` indicates that we have:
- A fully filled d-subshell with 10 electrons.
- A filled s-subshell with 2 electrons.

### Step 2: Identify the Elements with this Configuration
The elements that typically have this configuration are found in the d-block of the periodic table, specifically in the transition metals. The elements that fit this configuration are:
- Zinc (Zn)
- Cadmium (Cd)
- Mercury (Hg)

### Step 3: Write the Electronic Configurations of the Elements
1. **Zinc (Zn)**:
- Atomic number: 30
- Electronic configuration: [Ar] 3d^(10) 4s^(2)

2. **Cadmium (Cd)**:
- Atomic number: 48
- Electronic configuration: [Kr] 4d^(10) 5s^(2)

3. **Mercury (Hg)**:
- Atomic number: 80
- Electronic configuration: [Xe] 4f^(14) 5d^(10) 6s^(2)

### Step 4: Confirm the Configuration Matches
All three elements (Zn, Cd, Hg) have the electronic configuration of `(n-1)d^(10)ns^(2)`, where:
- For Zn, n=4
- For Cd, n=5
- For Hg, n=6

### Conclusion
The electronic configuration `(n-1)d^(10)ns^(2)` corresponds to the elements Zinc, Cadmium, and Mercury.

### Final Answer
The correct answer is that the electronic configuration `(n-1)d^(10)ns^(2)` is associated with Zinc (Zn), Cadmium (Cd), and Mercury (Hg).

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