Mg · magnesium

마그네슘

Takeaway

Recommended or revised 7 times between 1902 and 2024 (first record 1902, latest revision 2011).
The one revision whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
Since 2011, it has been given as the interval [24.304, 24.307] rather than a single value (the range found in normal materials).

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	24.36	no uncertainty	O=16	24.3590865		10.1007/BF01370337
1909	24.32	no uncertainty	O=16	24.319088		10.1021/ja01931a001
1961	24.312	no uncertainty	12C=12	24.312		10.1021/ja00881a001
1967	24.305	no uncertainty	12C=12	24.305		10.1351/pac196918040569
1969	24.305(1)	value(uncertainty)	12C=12	24.305		10.1351/pac197021010091
1985	24.3050(6)	value(uncertainty)	12C=12	24.305	0.000	10.1351/pac198658121677
2011	[24.304, 24.307]	interval	12C=12	24.3055 (interval midpoint, for calculation)		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