Ne · neon

네온

Takeaway

Recommended or revised 7 times between 1902 and 2024 (first record 1902, latest revision 1985).
Both revisions whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
The current standard atomic weight is 20.1797(6) (recommended in 1985).

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	20	no uncertainty	O=16	19.99925		10.1007/BF01370337
1909	20.0	no uncertainty	O=16	19.99925		10.1021/ja01931a001
1911	20.2	no uncertainty	O=16	20.1992425		10.1021/ja01928a001
1931	20.183	no uncertainty	O=16	20.18224314		10.1039/JR9310001617
1967	20.179(3)	value(uncertainty)	12C=12	20.179		10.1351/pac196918040569
1979	20.179(1)	value(uncertainty)	12C=12	20.179	0.000	10.1351/pac198052102349
1985	20.1797(6)	value(uncertainty)	12C=12	20.1797	0.700	10.1351/pac198658121677

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