# Pauli's Exculusion Principle

1. Jan 22, 2005

### DB

I know that pauli's exclusion principle states that no 2 identical fermions can occupy the same quantum state. I understand this for let's say a He atom, but what is going on in 2nd energy level of a Neon atom? How are all the electrons in different quantum states?

Thanks

2. Jan 22, 2005

### dextercioby

Write down the electron shell+subshell configuration of Neon and label each electron through its 4 quantum numbers.

Daniel.

3. Jan 22, 2005

### DB

Thanks
n=1 shell
$$1s^2$$

n=2 shell
$$2s^2,2p^6$$

I dont know how do do this...

4. Jan 22, 2005

### dextercioby

So far it's chemistry (sure derived from QM).Question:Do u know QM??

Daniel.

5. Jan 22, 2005

### DB

Umm, I have the understandin of QM, If you could give me a brief explanation of the quantum numbers and the exclusion principle I would research on it and learn more about it.

6. Jan 22, 2005

### dextercioby

The part with the quantum numbers and their origin/signification is more complex & pretty mathematical.Do you know group theory???

Daniel.

7. Jan 22, 2005

### DB

No, maybe I'm too undereducated to understand the exclusion principle, maybe you can point me in the right direction, where should I start?

8. Jan 23, 2005

### dextercioby

With a solid course on analytical mechanics.Quantum Mechanics quantizes classical system described by Hamilton's formulation of Classical Mechanics.

Daniel.

9. Jan 23, 2005

### da_willem

10. Jan 23, 2005

Thanks