According to the Pauli exclusion principle, why is it that any given orbital can

Question

According to the Pauli exclusion principle, why is it that any given orbital can hold no more than two electrons?

-Electrons have to spin in the same direction. -The orbitals in a multielectron atom do not have the same energy, so there is space for only two electrons in an orbital. -There are only two possible values for electron spin, so there are only two possible unique sets of quantum numbers describing the electrons in a given orbital.- -Too much energy would be required if there were three electrons in the same orbital.

Explanation / Answer

Answer is

There are only two possible values for electron spin, so there are only two possible unique sets of quantum numbers describing the electrons in a given orbital.

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