We would not be using silver for coins, jewelry, solder, or photography. We would use other metals instead. The development of photography would have happened very differently, early chemical film and developement relied heavily on silver. read more
Natural yttrium (39 Y) is composed of a single isotope yttrium-89. The most stable radioisotopes are 88 Y, which has a half-life of 106.6 days and 91 Y with a half-life of 58.51 days. All the other isotopes have half-lives of less than a day, except 87 Y, which has a half-life of 79.8 hours, and 90 Y, with 64 hours. read more