Column Descriptions Relative Isotopic Standard Isotope Atomic Mass Composition Atomic Weight Notes _________________________________________________________________________ 24 Cr 50 49.94604183(94) 0.04345(13) 51.9961(6) 52 51.94050623(63) 0.83789(18) 53 52.94064815(62) 0.09501(17) 54 53.93887916(61) 0.02365(7) _________________________________________________________________________NIST | Physical Measurement Laboratory | Physical Reference Data | Atomic Weights and Isotopic Compositions Main Page