Ga · gallium

갈륨

Takeaway

Recommended or revised 7 times between 1902 and 2024 (first record 1902, latest revision 1987).
Both revisions whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
The current standard atomic weight is 69.723(1) (recommended in 1987).

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	70.0	no uncertainty	O=16	69.997375		10.1007/BF01370337
1909	69.9	no uncertainty	O=16	69.89737875		10.1021/ja01931a001
1920	70.1	no uncertainty	O=16	70.09737125		10.1021/ja02233a600
1925	69.72	no uncertainty	O=16	69.7173855		10.1039/CT9252700913
1969	69.72(1)	value(uncertainty)	12C=12	69.72		10.1351/pac197021010091
1983	69.723(4)	value(uncertainty)	12C=12	69.723	0.300	10.1351/pac198456060653
1987	69.723(1)	value(uncertainty)	12C=12	69.723	0.000	10.1351/pac198860060841

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