Neutrons are baryons (fermionic hadrons). They have half integral spin, (intrinsic angular momentum), and obey the Pauli Exclusion Principle. According to the standard model, neutrons, along with 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.

Note: neutrons are stable in a nucleus, but only the proton is stable in iosolation.

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