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The Pauli exclusion principle states that two identical fermions, (so with half-integer spin) cannot occupy the same quantum state simultaneously, and thus share all of their quantum numbers. Also use for structure and classification schemes involving antisymmetry.

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In a 2-electron system (such as Helium atom), is the Total Angular Momentum quantum number $...

In a 1-electron system (such as Hydrogen atom), the Total Angular Momentum quantum number $j = \ell \pm s$. Due to Pauli Exclusion Principle, does that mean a 2-electron system (such as Helium atom) w …
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