Column Descriptions Relative Isotopic Standard Isotope Atomic Mass Composition Atomic Weight Notes _________________________________________________________________________ 28 Ni 58 57.93534241(52) 0.68077(19) 58.6934(4) r 60 59.93078588(52) 0.26223(15) 61 60.93105557(52) 0.011399(13) 62 61.92834537(55) 0.036346(40) 64 63.92796682(58) 0.009255(19) _________________________________________________________________________NIST | Physical Measurement Laboratory | Physical Reference Data | Atomic Weights and Isotopic Compositions Main Page