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A proton is a stable subatomic particle, symbol. p. , H +, or 1 H + with a positive electric charge of +1 e (elementary charge). Its mass is slightly less than the mass of a neutron and approximately 1836 times the mass of an electron (the proton-to-electron mass ratio). Protons and neutrons, each with a mass of approximately one atomic mass ...
Atomic nucleus - Wikipedia ... Atomic nucleus
Atom - Wikipedia ... Atom
Elementary particle
Subatomic particle
Photon - Wikipedia ... Photon
Atomic number - Wikipedia ... Atomic number
The photon structure function, in quantum field theory, describes the quark content of the photon. While the photon is a massless boson, through certain processes its energy can be converted into the mass of massive fermions. The function is defined by the process e + γ → e + hadrons. It is uniquely characterized by the linear increase in ...