damichealrusse15 damichealrusse15 05-01-2022 Chemistry contestada 1. Rubidium is a soft, silvery-white metal that has two common isotopes, 35Rb and Rb. The atomic mass of 84.911789 amu (72.17%), and Rb has an atomic mass of 86.909183 amu (27.38%). What is the average atomic mass of Rubidium?