Electric charge review (article) | Khan Academy

The protons are just…there in atoms.
Their role is to generate an electric force to bind the electrons to an atom, simply put. Every-Single-Atom have them.
About their origin, I think we would have to focus upon the theory of conservation of charge, which states that the net charge of a closed system remains constant overtime. So, from and after the formation of the universe, we can reasonably assume that whatever caused the formation of electron must also have simultaneously (at the same time) produced a positive charged particle (let it be a sub-atomic particle or something, I don’t know the exact name, because I don’t know much, if any, about quantum physics.) , thus neutralizing the effect the generation of the electron might have had upon the total charge of the universe. This mystery particle (might not be a mystery today anymore) might have been the proton itself, or something which gave the positive charge for the proton.

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