Column Descriptions Relative Isotopic Standard Isotope Atomic Mass Composition Atomic Weight Notes _________________________________________________________________________ 44 Ru 96 95.90759025(49) 0.0554(14) 101.07(2) g 98 97.9052868(69) 0.0187(3) 99 98.9059341(11) 0.1276(14) 100 99.9042143(11) 0.1260(7) 101 100.9055769(12) 0.1706(2) 102 101.9043441(12) 0.3155(14) 104 103.9054275(28) 0.1862(27) _________________________________________________________________________NIST | Physical Measurement Laboratory | Physical Reference Data | Atomic Weights and Isotopic Compositions Main Page