What electron sublevel starts to fill after completion of the $$ 4 f $$ sublevel?

Question

UpStudy AI · Accepted Answer

After the $$ 4f $$ sublevel is completely filled, the next electron sublevel to begin filling is the $$ 5d $$ sublevel.

### Understanding the Order of Electron Filling

Electron orbitals fill in a specific order based on their energy levels, which is generally determined by the **Aufbau principle**. The order is primarily based on the increasing values of $$ n + l $$, where:
- $$ n $$ is the principal quantum number.
- $$ l $$ is the azimuthal quantum number.

For orbitals with the same $$ n + l $$ value, the orbital with the lower principal quantum number $$ n $$ fills first.

Here's a simplified order of orbital filling up to the $$ 5d $$ sublevel:

1. **1s**
2. **2s**
3. **2p**
4. **3s**
5. **3p**
6. **4s**
7. **3d**
8. **4p**
9. **5s**
10. **4d**
11. **5p**
12. **6s**
13. **4f**
14. **5d**

### Example: Lutetium (Lu)

Lutetium, which has an atomic number of 71, has the electron configuration:
$$ [Xe] \, 6s^2 \, 4f^{14} \, 5d^1 $$

This shows that after the $$ 4f $$ sublevel is filled, electrons begin to occupy the $$ 5d $$ sublevel.

### Summary

- **After $$ 4f $$**: The next sublevel to fill is **$$ 5d $$**.

**Answer:** After the 4f sublevel is filled, electrons begin to occupy the five d (5d) sublevel.
After the 4f sublevel is filled, electrons begin to occupy the 5d sublevel.

What electron sublevel starts to fill after completion of the sublevel?

Upstudy AI Solution

Answer

Solution

Understanding the Order of Electron Filling

Example: Lutetium (Lu)

Summary

Beyond the Answer

Related Questions

Latest Chemistry Questions