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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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Position of protons and neutrons in a nucleus

According to the Wikipedia article on atomic nucleus, captioned on an impression of helium atom, it states that This depiction shows the particles as separate, whereas in an actual helium atom, th …
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