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Pauli Exclusion Principle

Posted: Fri Oct 07, 2016 4:43 pm
by Brian_Mena_1J
For clarification, does Pauli's principle just state that in the same orbital electrons can only be paired. For example, the 2s orbital having 2 electrons can only happen if they are paired.

Re: Pauli Exclusion Principle  [ENDORSED]

Posted: Fri Oct 07, 2016 4:58 pm
by Eunnie_Lee_3H
Yes, 2 electrons can both be in 1 orbital (ml) only as long as they are paired (have different spins, AKA different ms values). They cannot have the same spin (both +1/2 or both -1/2), if they're to inhabit the same orbital.

Pauli's exclusion principle also states that each orbital can only have 2 electrons at most.
So for an orbital 2px, for instance, you can't have 3 electrons in that orbital, though you can have none, 1, or 2 electrons. And, if you have 2 electrons in the orbital (perhaps because the other orbitals 2py and 2pz each have 1 electron), the ms of one of the electrons in 2px will be +1/2 and the other electron's ms will be -1/2.