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Atomic weight

P · phosphorus

인

Takeaway
  • Recommended or revised 13 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 30.973 761 998(5) (recommended in 2013).
0+10⁻⁹−10⁻⁹+10⁻⁷−10⁻⁷+10⁻⁵−10⁻⁵+10⁻³−10⁻³19001920194019601980200020201961 scale change
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 recommendationValue (as printed)as printed in CIAAW's table; digits in parentheses are the uncertainty (expanded range) in the last digitsNotationvalue(uncertainty), interval or no uncertaintyScalebefore 1961 oxygen = 16, from 1961 ¹²C = 12Value, ¹²C scalepre-1961 values multiplied by 15.9994/16z vs previous(new − previous) ÷ previous uncertaintyReportDOI of the CIAAW report
190231.0no uncertaintyO=1630.998837510.1007/BF01370337
191131.04no uncertaintyO=1631.03883610.1021/ja01928a001
192531.027no uncertaintyO=1631.0258364910.1039/CT9252700913
193131.02no uncertaintyO=1631.0188367510.1039/JR9310001617
193930.98no uncertaintyO=1630.9788382510.1039/JR9390000351
195130.975no uncertaintyO=1630.9738384410.1039/JR9530000001
196130.9738no uncertainty12C=1230.973810.1021/ja00881a001
196930.9738(1)value(uncertainty)12C=1230.973810.1351/pac197021010091
197130.973 76(1)value(uncertainty)12C=1230.97376−0.40010.1351/pac197230030637
198530.973 762(4)value(uncertainty)12C=1230.9737620.20010.1351/pac198658121677
199530.973 761(2)value(uncertainty)12C=1230.973761−0.25010.1351/pac199668122339
200530.973 762(2)value(uncertainty)12C=1230.9737620.50010.1351/pac200678112051
201330.973 761 998(5)value(uncertainty)12C=1230.973762−0.00110.1515/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