Column Descriptions Relative Isotopic Standard Isotope Atomic Mass Composition Atomic Weight Notes _________________________________________________________________________ 78 Pt 190 189.9599297(63) 0.00012(2) 195.084(9) 192 191.9610387(32) 0.00782(24) 194 193.9626809(10) 0.3286(40) 195 194.9647917(10) 0.3378(24) 196 195.96495209(99) 0.2521(34) 198 197.9678949(23) 0.07356(130) _________________________________________________________________________NIST | Physical Measurement Laboratory | Physical Reference Data | Atomic Weights and Isotopic Compositions Main Page