Cs · caesium

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Takeaway

Recommended or revised 11 times between 1902 and 2024 (first record 1902, latest revision 2013).
All 5 revisions whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
The current standard atomic weight is 132.905 451 96(6) (recommended in 2013).

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	133	no uncertainty	O=16	132.9950125		10.1007/BF01370337
1904	132.9	no uncertainty	O=16	132.89501625		10.1021/ja01991a001
1909	132.81	no uncertainty	O=16	132.80501962		10.1021/ja01931a001
1934	132.91	no uncertainty	O=16	132.90501588		10.1039/JR9340000499
1961	132.905	no uncertainty	12C=12	132.905		10.1021/ja00881a001
1969	132.9055(1)	value(uncertainty)	12C=12	132.9055		10.1351/pac197021010091
1971	132.9054(1)	value(uncertainty)	12C=12	132.9054	−1.000	10.1351/pac197230030637
1985	132.905 43(5)	value(uncertainty)	12C=12	132.90543	0.300	10.1351/pac198658121677
1995	132.905 45(2)	value(uncertainty)	12C=12	132.90545	0.400	10.1351/pac199668122339
2005	132.905 4519(2)	value(uncertainty)	12C=12	132.9054519	0.095	10.1351/pac200678112051
2013	132.905 451 96(6)	value(uncertainty)	12C=12	132.90545196	0.300	10.1515/pac-2015-0305

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