Cr · chromium

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Takeaway

Recommended or revised 7 times between 1902 and 2024 (first record 1902, latest revision 1983).
Both revisions whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
The current standard atomic weight is 51.9961(6) (recommended in 1983).

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	52.1	no uncertainty	O=16	52.09804625		10.1007/BF01370337
1910	52.0	no uncertainty	O=16	51.99805		10.1021/ja01919a001
1925	52.01	no uncertainty	O=16	52.00804962		10.1039/CT9252700913
1961	51.996(1)	value(uncertainty)	12C=12	51.996		10.1021/ja00881a001
1967	51.996	no uncertainty	12C=12	51.996	0.000	10.1351/pac196918040569
1969	51.996(1)	value(uncertainty)	12C=12	51.996		10.1351/pac197021010091
1983	51.9961(6)	value(uncertainty)	12C=12	51.9961	0.100	10.1351/pac198456060653

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