Chemistry / Chem 0844 · Atom · ~20 seconds
The Pauli Exclusion Principle
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The Pauli exclusion principle states no two electrons in one atom share the same complete set of four quantum numbers.
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Two electrons in the same orbital, sharing n, l, and ml, must carry opposite ms values.
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This principle limits every orbital to two electrons, since only two spin values remain once n, l, and ml are fixed.