| Protons are baryons (fermionic hadrons). They have half integral spin (intrinsic angular momentum). They obey the Pauli Exclusion Principle. No two baryons can occupy the same quantum state, which describes how protons sequentially fill the shells of a nucleus. According to the standard model, all baryons contain three quarks. Each baryon has an anti-particle made up of three anti-quarks. Just four of the many baryons are listed below. |
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