IsotopeAtomic mass (Da)Isotopic abundance (amount fraction)
112Sn 111.904825(2)0.0097(1)
114Sn 113.9027801(2)0.0066(1)
115Sn 114.9033447(1)0.0034(1)
116Sn 115.9017428(6)0.1454(9)
117Sn 116.902954(3)0.0768(7)
118Sn 117.901607(3)0.2422(9)
119Sn 118.903311(5)0.0859(4)
120Sn 119.902202(6)0.3258(9)
122Sn 121.90344(2)0.0463(3)
124Sn 123.905277(7)0.0579(5)
In its 1961 report, the Commission recommended Ar(Sn) = 118.69 based on chemical-ratio determinations. From these measurements, with current values of the atomic weights of the other elements involved, the followingatomic weights for Sn are derived: Ar(Sn) = 118.686, 118.691, and 118.701. The Commission was also aware that three mass-spectrometric determinations had been made thatyield slightly higher atomic-weight values.

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Tin has ten stable isotopes, the largest number of all elements. Because of this,the isotopic composition measurements involve an unusually large number of experimentallydetermined ratios, each subject to uncertainty. In 1969, the Commission assessed Ar(Sn) = 118.69(3) therefore preferring the chemically determined atomic-weight values. Thisviewpoint was reaffirmed until 1983 when the Commission was able to consider the firstcalibrated mass-spectrometric measurement, which reported Ar(Sn) = 118.7099(22) and demonstrated good agreement with many previous isotope-abundance measurements(after correcting those uncalibrated measurements for isotope fractionation). In 1983 the Commission changed the basis for the standard atomic weight of tin to mass spectrometry and thevalue to Ar(Sn) = 118.710(7).

The "g" annotation arises from the presence of naturally occurring fission products found in fossil reactors at Gabon, southwest Africa.

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SOURCEAtomic weights of the elements: Review 2000 by John R de Laeter et al. Pure Appl. Chem. 2003 (75) 683-800© IUPAC 2003

TinAr(Sn) = 118.710(7) since 1983The name derives from the Anglo-Saxon tin of unknown origin. The symbol Sn is derivedfrom Latin stannum for alloys containing lead. The element was known in prehistoric times.