W · tungsten

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Takeaway

Recommended or revised 6 times between 1902 and 2024 (first record 1902, latest revision 1991).
The one revision whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
The current standard atomic weight is 183.84(1) (recommended in 1991).

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 recommendation	Value (as printed)as printed in CIAAW's table; digits in parentheses are the uncertainty (expanded range) in the last digits	Notationvalue(uncertainty), interval or no uncertainty	Scalebefore 1961 oxygen = 16, from 1961 ¹²C = 12	Value, ¹²C scalepre-1961 values multiplied by 15.9994/16	z vs previous(new − previous) ÷ previous uncertainty	ReportDOI of the CIAAW report
1902	184.0	no uncertainty	O=16	183.9931		10.1007/BF01370337
1938	183.92	no uncertainty	O=16	183.913103		10.1039/JR9380001101
1955	183.86	no uncertainty	O=16	183.85310525		10.1021/ja01595a001
1961	183.85	no uncertainty	12C=12	183.85		10.1021/ja00881a001
1969	183.85(3)	value(uncertainty)	12C=12	183.85		10.1351/pac197021010091
1991	183.84(1)	value(uncertainty)	12C=12	183.84	−0.333	10.1351/pac199264101519

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