Cu · copper

구리

Takeaway

Recommended or revised 5 times between 1902 and 2024 (first record 1902, latest revision 1969).
The one revision whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
The current standard atomic weight is 63.546(3) (recommended in 1969).

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	63.6	no uncertainty	O=16	63.597615		10.1007/BF01370337
1909	63.57	no uncertainty	O=16	63.56761612		10.1021/ja01931a001
1947	63.54	no uncertainty	O=16	63.53761725		10.1039/JR9510000001
1965	63.546(1)	value(uncertainty)	12C=12	63.546		10.1351/pac196918040569
1969	63.546(3)	value(uncertainty)	12C=12	63.546	0.000	10.1351/pac197021010091

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