Baryon number is a quantum number in particle physics that represents the total number of baryons in a system. Baryons are a class of subatomic particles that include protons and neutrons, which are the building blocks of atomic nuclei. The baryon number is defined as follows: - Each baryon (like protons and neutrons) has a baryon number of +1.
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Baryon number assigns to each quark, to each antiquark and zero to leptons. A proton has baryon number one.