The most common hadron, a baryon with electric charge +1 equal and opposite to that of the electron.

The central nucleus of an atom is formed from protons and neutrons. The nucleus of a hydrogen atom has a single proton.

The proton consists of two up and one down quark.

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proton mass 1.67262158e-27 kgClip
proton-muon mass ratio 8.88024408 Clip
proton-tau mass ratio 0.527994 Clip
proton-electron mass ratio 1836.1526675 Clip
proton-neutron mass ratio 0.99862347855 Clip
proton charge to mass quotient 9.57883408e7 Ckg-1Clip
proton molar mass 1.00727646688e-3 kgmol-1Clip
proton Compton wavelength 1.321409847e-15 mClip
proton magnetic moment 1.410606633e-26 JT-1Clip
proton g-factor 5.585694675 Clip
proton-neutron magnetic moment ratio -1.45989805 Clip
proton gyromagnetic ratio 2.67522212e8 s-1T-1Clip
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A nucleus with atomic number Z contains Z protons; therefore the number of protons is what distinguishes the different chemical elements.

See also: Alvarez, Luis Walter, Antiproton, Atomic Particle, Cosmotron, Electron, Exclusion Principle, Neutron, Nucleus, Particle Accelerator, Physical Constants, Proton Donor, Solar Protons.

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Subjects: Nuclear and Particle Physics