Isotopes of silver
Naturally occurring silver (Ag) is composed of the two stable isotopes Ag and Ag in almost equal proportions, with Ag being slightly more abundant (51.839% natural abundance). 40 radioisotopes have been characterized with the most stable being Ag with a half-life of 41.29 days, Ag with a half-life of 7.43 days, and Ag with a half-life of 3.13 hours. All of the remaining radioactive isotopes have half-lives that are less than an hour, and the majority of these have half-lives that are less than 3 minutes. This element has numerous meta states , with the most stable being Ag ("t" 439 years), Ag ("t" 249.86 days) and Ag ("t" 8.28 days). Isotopes of silver range in atomic weight from 91.960 u (Ag) to 132.969 u (Ag). The primary decay mode before the most abundant stable isotope, Ag, is electron capture and the primary mode after is beta decay. The primary decay products before Ag are palladium (element 46) isotopes and the primary products after are cadmium (element 48) isotopes. The palladium isotope Pd decays by beta emission to Ag with a half-life of 6.5 million years. Iron meteorites are the only objects  with a high enough palladium/silver ratio to yield measurable variations in Ag abundance. Radiogenic Ag was first discovered in the Santa Clara meteorite in 1978. The discoverers suggest that the coalescence and differentiation of iron-cored small planets may have occurred 10 million years after a nucleosynthetic event. Pd versus Ag correlations observed in bodies, which have clearly been melted since the accretion of the Solar System, must reflect the presence of live short-lived nuclides in the early Solar System.