Cząstka elementarna, symbol: p, o dodatnim ładunku jednostkowym e (ładunek elektronu) i masie spoczynkowej 1,67262192 × 10-27 kg (co odpowiada energii 938,2592 MeV). Jest cząstką trwałą. Razem z neutronami wchodzi w skład jąder wszystkich pierwiastków chemicznych. Najlżejszy izotop wodoru H-1 ma jądro złożone wyłącznie z jednego protonu.
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