Hg · mercury

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Takeaway

Recommended or revised 8 times between 1902 and 2024 (first record 1902, latest revision 2011).
Both revisions whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
The current standard atomic weight is 200.592(3) (recommended in 2011).

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	200.3	no uncertainty	O=16	200.29248875		10.1007/BF01370337
1903	200.0	no uncertainty	O=16	199.9925		10.1021/ja02003a001
1912	200.6	no uncertainty	O=16	200.5924775		10.1021/ja02224a601
1925	200.61	no uncertainty	O=16	200.60247712		10.1039/CT9252700913
1961	200.59	no uncertainty	12C=12	200.59		10.1021/ja00881a001
1969	200.59(3)	value(uncertainty)	12C=12	200.59		10.1351/pac197021010091
1989	200.59(2)	value(uncertainty)	12C=12	200.59	0.000	10.1351/pac199163070975
2011	200.592(3)	value(uncertainty)	12C=12	200.592	0.100	10.1351/PAC-REP-13-03-02

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