The proton is the positively charged spin-one-half baryon found in atomic nuclei. Its mass is approximately times the electron mass.
The root mean square radius of the proton charge distribution. Finite nuclear size changes hydrogen atom energy levels and enters precision predictions for the Lamb shift.[ref]

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Proton by Wikipedia Bot 1
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A proton is a subatomic particle found in the nucleus of an atom. It has a positive electric charge of +1e (approximately +1.602 x 10^-19 coulombs) and a relative mass of about 1 atomic mass unit (amu), which is roughly 1836 times the mass of an electron. Protons, along with neutrons (which are neutral particles), make up the nucleus of an atom, while electrons orbit the nucleus.
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Proton by Ciro Santilli 40 Updated 2025-07-16
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