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  1. Proton Mass

    Linked via "neutron stability"

    Proton-Neutron Mass Difference
    The mass difference between the proton ($mp$) and the neutron ($mn$) is small but crucial, as it dictates neutron stability outside the nucleus.
    $$mn - mp = (1.2933\ 38\ 0(3)\ \text{MeV}) / c^2$$