(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Write down the electonic configuration for the O atom. Write down the quantum numbers [itex](n,l,m_l,m_s)[/itex] for each one of the electrons.

2. Relevant equations

Pauli exclusion principle. Least energy principle for filling the shells.

3. The attempt at a solution

[itex]1s^22s^22p^4[/itex].

I have trouble for the electrons on the 2p shell.

The quantum numbers of the electrons are:

(1,0,0,1/2)

(1,0,0,-1/2)

(2,0,0,1/2)

(2,0,0,-1/2)

Here I am not sure:

(2,1,0,1/2)

(2,1,0,-1/2)

And 2 more electrons but I really don't know which quantum numbers to choose. They all have the same energy (degenerated). An external magnetic field would solve some degeneracy (the [itex]m_l[/itex] one, not the [itex]m_s[/itex] one).

So...

[itex](2,1,\pm 1 , \pm 1/2)[/itex] and [itex](2,1,0 , \pm 1/2)[/itex] are all possible for the 4 electrons.

However if I apply an external magnetic field, I can discard [itex]m_l=1[/itex], right?

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# Electrons and their quantum numbers for the oxygen atom

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