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Atomic weight

I · iodine

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Takeaway
  • Recommended or revised 9 times between 1902 and 2024 (first record 1902, latest revision 1985).
  • The one revision whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
  • The current standard atomic weight is 126.904 47(3) (recommended in 1985).
0+10⁻⁶−10⁻⁶+10⁻⁵−10⁻⁵+10⁻⁴−10⁻⁴+10⁻³−10⁻³19001920194019601980200020201961 scale change
Relative deviation from the current (or last) value, symmetric-log axis. Bars: uncertainty (expanded range); open circles: no uncertainty; orange boxes: intervals.
Yearyear of the recommendationValue (as printed)as printed in CIAAW's table; digits in parentheses are the uncertainty (expanded range) in the last digitsNotationvalue(uncertainty), interval or no uncertaintyScalebefore 1961 oxygen = 16, from 1961 ¹²C = 12Value, ¹²C scalepre-1961 values multiplied by 15.9994/16z vs previous(new − previous) ÷ previous uncertaintyReportDOI of the CIAAW report
1902126.85no uncertaintyO=16126.8452431210.1007/BF01370337
1905126.97no uncertaintyO=16126.9652386210.1021/ja01979a001
1909126.92no uncertaintyO=16126.915240510.1021/ja01931a001
1925126.932no uncertaintyO=16126.9272400510.1039/CT9252700913
1933126.92no uncertaintyO=16126.915240510.1039/JR9330000354
1951126.91no uncertaintyO=16126.9052408810.1039/JR9530000001
1961126.9044no uncertainty12C=12126.904410.1021/ja00881a001
1969126.9045(1)value(uncertainty)12C=12126.904510.1351/pac197021010091
1985126.904 47(3)value(uncertainty)12C=12126.90447−0.30010.1351/pac198658121677

Source: Standard atomic weights © IUPAC/CIAAW 2016–2024. Commission on Isotopic Abundances and Atomic Weights, Historical changes of standard atomic weights (compiled by J. Meija), https://www.ciaaw.org/historical-atomic-weights.htm