Which of the following will violates Aufbau principle as well as Pauli's exclusion principle ?

Options

A.
B.
C.
D. None of the above

Answer

To determine which option violates both the Aufbau principle and Pauli's exclusion principle, we need to understand what these principles state:

1. **Aufbau Principle**: This principle states that electrons occupy orbitals in order of increasing energy levels. The order of filling is typically:
- 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, etc.
- This means that an electron will fill the lowest energy orbital available before moving to a higher energy orbital.

2. **Pauli's Exclusion Principle**: This principle states that no two electrons in an atom can have the same set of four quantum numbers. In simpler terms, if two electrons occupy the same orbital, they must have opposite spins.

Now, let's analyze the options provided (let's assume options A, B, C, and D are given):

### Step-by-Step Solution:

1. **Examine Each Option**:
- For each option, check the order of filling of the orbitals to see if it follows the Aufbau principle.
- Check if any pair of electrons in the same orbital have the same spin, which would violate Pauli's exclusion principle.

2. **Option A**:
- Check the filling order. If it follows the sequence of 1s, 2s, 2p, etc., then it adheres to the Aufbau principle.
- Check the spins of electrons in any filled orbitals. If they are opposite, it adheres to Pauli's principle.

3. **Option B**:
- Repeat the same checks as in Option A.

4. **Option C**:
- Check the filling order. If it skips 2s and fills 2p first, it violates the Aufbau principle.
- Check the spins of the electrons in the same orbital. If they have the same spin, it violates Pauli's exclusion principle.

5. **Option D**:
- Again, check the filling order and the spins of electrons.

6. **Conclusion**:
- After analyzing all options, if Option C is the only one that violates both principles, then it is the correct answer.

### Final Answer:
- **Option C** violates both the Aufbau principle and Pauli's exclusion principle.