An antiproton is the antiparticle of the proton, which is one of the fundamental constituents of atomic nuclei. In particle physics, every particle has a corresponding antiparticle that has the same mass but opposite charge and other quantum numbers. Specifically, an antiproton has: - A mass equal to that of a proton (approximately 938.3 MeV/c²). - A negative electric charge (-1e), as opposed to the positive charge (+1e) of a proton.
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