These 53 stable nuclides have an even number of protons and an odd number of neutrons. By definition, they are all isotopes of even- Z elements, where they are a minority in comparison to the even–even isotopes which are about 3 times as numerous. Among the 41 even- Z elements that have a stable nuclide, only two elements (argon and cerium) have no even–odd stable nuclides. One element (tin) has three. There are 24 elements that have one even–odd nuclide and 13 that have two even–odd nuclides. The lightest example of this type of nuclide is 2 He and the heaviest is 82 Pb.