Chemistry / Unit 5 Chem 0844 short lesson, about 20 seconds
The Pauli Exclusion Principle
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The idea
The Pauli exclusion principle states no two electrons in one atom share the same complete set of four quantum numbers.
In practice
Two electrons in the same orbital, sharing n, l, and ml, must carry opposite ms values.
Where people slip
This principle limits every orbital to two electrons, since only two spin values remain once n, l, and ml are fixed.
Your place on the trail
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