Column Descriptions Relative Isotopic Standard Isotope Atomic Mass Composition Atomic Weight Notes _________________________________________________________________________ 52 Te 120 119.9040593(33) 0.0009(1) 127.60(3) g 122 121.9030435(16) 0.0255(12) 123 122.9042698(16) 0.0089(3) 124 123.9028171(16) 0.0474(14) 125 124.9044299(16) 0.0707(15) 126 125.9033109(16) 0.1884(25) 128 127.90446128(93) 0.3174(8) 130 129.906222748(12) 0.3408(62) _________________________________________________________________________NIST | Physical Measurement Laboratory | Physical Reference Data | Atomic Weights and Isotopic Compositions Main Page