Write the electronic configuration of the element having atomic number `56`

Answer

To write the electronic configuration of the element with atomic number 56, we will follow these steps:

### Step 1: Identify the Element
The atomic number 56 corresponds to the element Barium (Ba).

### Step 2: Understand the Aufbau Principle
The Aufbau principle states that electrons fill atomic orbitals in order of increasing energy levels. The order of filling is typically:
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p.

### Step 3: Fill the Orbitals
We will fill the orbitals according to the Aufbau principle until we reach the atomic number 56:

1. **1s**: 2 electrons → 1s²
2. **2s**: 2 electrons → 2s²
3. **2p**: 6 electrons → 2p⁶
4. **3s**: 2 electrons → 3s²
5. **3p**: 6 electrons → 3p⁶
6. **4s**: 2 electrons → 4s²
7. **3d**: 10 electrons → 3d¹⁰
8. **4p**: 6 electrons → 4p⁶
9. **5s**: 2 electrons → 5s²
10. **4d**: 10 electrons → 4d¹⁰
11. **5p**: 6 electrons → 5p⁶
12. **6s**: 2 electrons → 6s²

### Step 4: Combine the Configuration
Now, we combine all the filled orbitals to write the complete electronic configuration for Barium:

The electronic configuration of Barium (Ba, atomic number 56) is:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s²

### Final Answer
The electronic configuration of the element with atomic number 56 (Barium) is:
**1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s²**

---