B · boron

붕소

Takeaway

Recommended or revised 8 times between 1902 and 2024 (first record 1902, latest revision 2009).
All 3 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 [10.806, 10.821] 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	11	no uncertainty	O=16	10.9995875		10.1007/BF01370337
1920	10.9	no uncertainty	O=16	10.89959125		10.1021/ja02233a600
1925	10.82	no uncertainty	O=16	10.81959425		10.1039/CT9252700913
1961	10.811(3)	value(uncertainty)	12C=12	10.811		10.1021/ja00881a001
1969	10.81(1)	value(uncertainty)	12C=12	10.81	−0.333	10.1351/pac197021010091
1983	10.811(5)	value(uncertainty)	12C=12	10.811	0.100	10.1351/pac198456060653
1995	10.811(7)	value(uncertainty)	12C=12	10.811	0.000	10.1351/pac199668122339
2009	[10.806, 10.821]	interval	12C=12	10.8135 (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