Mn has electronic configuration

Options

A. 2,8,8,7
B. 2,8,13,2
C. 1,8,14,1
D. 2,8,12,3

Answer

To determine the electronic configuration of manganese (Mn), follow these steps:

### Step 1: Identify the Atomic Number
- The atomic number of manganese (Mn) is 25. This means that a neutral manganese atom has 25 electrons.

### Step 2: Fill the Electron Shells
- Electrons are filled in atomic orbitals according to the Aufbau principle, which states that electrons occupy the lowest energy orbitals first.

### Step 3: Write the Electron Configuration
1. **1s Orbital:** The first two electrons fill the 1s orbital.
- Configuration: 1s²
2. **2s Orbital:** The next two electrons fill the 2s orbital.
- Configuration: 1s² 2s²
3. **2p Orbital:** The next six electrons fill the 2p orbital.
- Configuration: 1s² 2s² 2p⁶
4. **3s Orbital:** The next two electrons fill the 3s orbital.
- Configuration: 1s² 2s² 2p⁶ 3s²
5. **3p Orbital:** The next six electrons fill the 3p orbital.
- Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶
6. **4s Orbital:** The next two electrons fill the 4s orbital.
- Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
7. **3d Orbital:** The remaining five electrons fill the 3d orbital.
- Final Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵

### Step 4: Summarize the Configuration
- The complete electronic configuration of manganese is:
- **[Ar] 3d⁵ 4s²**
- Where [Ar] represents the electron configuration of Argon, which accounts for the first 18 electrons (1s² 2s² 2p⁶ 3s² 3p⁶).

### Final Answer
- The electronic configuration of manganese (Mn) is **[Ar] 3d⁵ 4s²**.

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