# Tag Info

In context of this answer, stable means not undergoing a radioactive decay, regardless of the value of measured half-life.(+) For light nuclei till about 40 nucleons, the neutron/proton ratio of stable isobars(the same nucleon count) is generally around 1.0. ( $\ce{^3He, T}$ are quite exception. ) Nuclei too aside from this ratio ( See Valley of stability ) ...