标准原子量

各类常数

STANDARD ATOMIC WEIGHTS (2001)

This table of atomic weights includes the changes made in 1999 and 2001 by the IUPAC Commission on Atomic Weights and

Isotopic Abundances. The Standard Atomic Weights apply to the elements as they exist naturally on Earth, and the uncertainties take into accountthe isotopic variation found in most laboratory samples. Further comments on the variability are given in the footnotes.

The number in parentheses following the atomic weight value gives the uncertainty in the last digit. An atomic weight entry in

brackets indicates that the element that has no stable isotopes; the value given is the atomic mass in u (or the mass number, if the mass is notaccurately known) for the isotope of longest half-life. Thorium, protactinium, and uranium have no stable isotopes, but the terrestrial isotopiccomposition is sufficiently uniform to permit a standard atomic weight to be specified.

REFERENCES

1.2.3.4.

Vocke, R. D., Pure Appl. Chem. 71, 1593, 1999.Coplen, T. D., Pure Appl. Chem. 73, 667, 2001.

Coplen, T. D., J. Phys. Chem. Ref. Data, 30, 701, 2001.

Loss, R. D., Report of the IUPAC Commission on Atomic Weights and Isotopic Abundances, Chemistry International, 23, 179, 2001.

NameActiniumAluminumAmericiumAntimonyArgonArsenicAstatineBariumBerkeliumBerylliumBismuthBohriumBoronBromineCadmiumCalciumCaliforniumCarbonCeriumCesiumChlorineChromiumCobaltCopperCuriumDubniumDysprosiumEinsteiniumErbiumEuropiumFermiumFluorineFranciumGadoliniumGalliumGermaniumGoldHafnium

SymbolAcAlAmSbArAsAtBaBkBeBiBhBBrCdCaCfCCeCsClCrCoCuCmDbDyEsErEuFmFFrGdGaGeAuHf

Atomic No.891395511833855697483107535482098658551724272996105669968631009876431327972

Atomic Weight[227.0277]26.981538(2)[243.0614]121.760(1)39.948(1)74.92160(2)[209.9871]137.327(7)[247.0703]9.012182(3)208.98038(2)[264.12]10.811(7)79.904(1)112.411(8)40.078(4)[251.0796]12.0107(8)140.116(1)132.90545(2)35.453(2)51.9961(6)58.933200(9)63.546(3)[247.0704][262.1141]162.500(1)[252.0830]167.259(3)151.964(1)[257.0951]18.9984032(5)[223.0197]157.25(3)69.723(1)72.64(1)196.96655(2)178.49(2)

Footnotes

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ag m rggag rgg m r

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