Cl · chlorine

염소

Takeaway

Recommended or revised 7 times between 1902 and 2024 (first record 1902, latest revision 2009).
Both revisions whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
Since 2009, it has been given as the interval [35.446, 35.457] 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	35.45	no uncertainty	O=16	35.44867062		10.1007/BF01370337
1909	35.46	no uncertainty	O=16	35.45867025		10.1021/ja01931a001
1925	35.457	no uncertainty	O=16	35.45567036		10.1039/CT9252700913
1961	35.453(1)	value(uncertainty)	12C=12	35.453		10.1021/ja00881a001
1985	35.4527(9)	value(uncertainty)	12C=12	35.4527	−0.300	10.1351/pac198658121677
1999	35.453(2)	value(uncertainty)	12C=12	35.453	0.333	10.1351/pac200173040667
2009	[35.446, 35.457]	interval	12C=12	35.4515 (interval midpoint, for calculation)		10.1351/PAC-REP-10-09-14

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