Identify orbitals which are filled in 6th period

Options

A. 6s,4f,5d,6p
B. 6s,6p,5f,6d
C. 6s,6p,6d,6f
D. 6s,5f,6p,6d

Answer

To identify the orbitals that are filled in the 6th period, we need to follow the order of filling according to the Aufbau principle. Let's break down the steps:

### Step-by-Step Solution:

1. **Identify the Period**: We are given the 6th period. In the periodic table, the periods correspond to the principal quantum number (n). For the 6th period, n = 6.

2. **Determine the Order of Filling**: The order of filling orbitals generally follows the sequence:
- ns (s-orbital)
- np (p-orbital)
- (n-1)d (d-orbital)
- (n-2)f (f-orbital)
- (n-3)g (g-orbital)

For n = 6, this translates to:
- 6s
- 6p
- 5d (since n-1 = 5)
- 4f (since n-2 = 4)
- 3g (since n-3 = 3, but g orbitals are not filled in the 6th period)

3. **List the Orbitals**: From the above order, the orbitals that will be filled in the 6th period are:
- 6s
- 6p
- 5d
- 4f

4. **Verify the Options**: If options are provided, we need to check which one matches the orbitals we have identified. In this case, we found 6s, 6p, 5d, and 4f.

5. **Conclusion**: The correct option will be the one that includes all of the identified orbitals: 6s, 6p, 5d, and 4f.