Mo · molybdenum

몰리브데넘

Takeaway

Recommended or revised 8 times between 1902 and 2024 (first record 1902, latest revision 2013).
All 4 revisions whose previous recommendation had an uncertainty kept the new value inside the previous (expanded) range.
The current standard atomic weight is 95.95(1) (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	96.0	no uncertainty	O=16	95.9964		10.1007/BF01370337
1938	95.95	no uncertainty	O=16	95.94640188		10.1039/JR9380001101
1961	95.94	no uncertainty	12C=12	95.94		10.1021/ja00881a001
1969	95.94(3)	value(uncertainty)	12C=12	95.94		10.1351/pac197021010091
1975	95.94(1)	value(uncertainty)	12C=12	95.94	0.000	10.1351/pac197647010075
2001	95.94(2)	value(uncertainty)	12C=12	95.94	0.000	10.1351/pac200375081107
2007	95.96(2)	value(uncertainty)	12C=12	95.96	1.000	10.1351/PAC-REP-09-08-03
2013	95.95(1)	value(uncertainty)	12C=12	95.95	−0.500	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