Ho · holmium

홀뮴

Takeaway

Recommended or revised 12 times between 1902 and 2024 (first record 1913, latest revision 2021).
All 6 revisions whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
The current standard atomic weight is 164.930 329(5) (recommended in 2021).

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
1913	163.5	no uncertainty	O=16	163.49386875		10.1021/ja02212a001
1925	163.4	no uncertainty	O=16	163.3938725		10.1039/CT9252700913
1931	163.5	no uncertainty	O=16	163.49386875		10.1039/JR9310001617
1941	164.94	no uncertainty	O=16	164.93381475		10.1039/JR9410000146
1961	164.930	no uncertainty	12C=12	164.93		10.1021/ja00881a001
1969	164.9303(1)	value(uncertainty)	12C=12	164.9303		10.1351/pac197021010091
1971	164.9304(1)	value(uncertainty)	12C=12	164.9304	1.000	10.1351/pac197230030637
1985	164.930 32(3)	value(uncertainty)	12C=12	164.93032	−0.800	10.1351/pac198658121677
1995	164.930 32(2)	value(uncertainty)	12C=12	164.93032	0.000	10.1351/pac199668122339
2013	164.930 33(2)	value(uncertainty)	12C=12	164.93033	0.500	10.1515/pac-2015-0305
2017	164.930 328(7)	value(uncertainty)	12C=12	164.930328	−0.100	10.1515/pac-2019-0603
2021	164.930 329(5)	value(uncertainty)	12C=12	164.930329	0.143	10.1515/pac-2019-0603

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