> A stable [subatomic](https://www.google.com/search?sca_esv=a0e199fc98d1a06b&sxsrf=ADLYWILmbnwQxsFx26fsDkmj1-wvVDwv9A:1715132125108&q=subatomic&si=ACC90nxMSPeZfdJJjQgDsdZJuFuJ3gUQFV0uT8hVxArDY0h0crGNALhmUK3vJ3MIkuIg6ZYf9oNPZmS4Vqyi_kuGrhWg3TbEJo1Okv_2DuMPvUgXUXAeeCw%3D&expnd=1&sa=X&sqi=2&ved=2ahUKEwiUgb2I9fyFAxUpHDQIHe3oDrwQyecJegQIKhAP) particle occurring in all atomic [nuclei](https://www.google.com/search?sca_esv=a0e199fc98d1a06b&sxsrf=ADLYWILmbnwQxsFx26fsDkmj1-wvVDwv9A:1715132125108&q=nuclei&si=ACC90nwdkA2npcVVmNPViiSe8FMKFmqZMaLVTRhhH7KYTwOrWT6LthpZ3Ar2WFkuTXpkpOvn90Csg7eec4jLrSdLF6nv64-0BA%3D%3D&expnd=1&sa=X&sqi=2&ved=2ahUKEwiUgb2I9fyFAxUpHDQIHe3oDrwQyecJegQIKhAQ), with a positive [[Electricity|Electric]] charge equal in magnitude to that of an electron, but of opposite sign.
- has same mass as [[Neutrons|Neutron]]

[](http://books.google.com/ngrams/graph?year_start=1800&year_end=2019&corpus=26&smoothing=7&case_insensitive=on&content=proton)