Every atomic nucleus contains one or more protons.
The Mass of the proton is about 1,840 times the mass of the Electron and slightly less than the mass of the Neutron . In 1919 Rutherford, Ernest discovered the proton as a product of the disintegration of the atomic nucleus. Research into the possibility that the proton may decay has been inconclusive but suggests that its life Time is at least 1031 years. See Elementary Particles .