Cadmium
| Isotope | Atomic mass (Da) | Isotopic abundance (amount fraction) |
|---|---|---|
| 106Cd | 105.906 460(8) | 0.012 45(22) |
| 108Cd | 107.904 184(8) | 0.008 88(11) |
| 110Cd | 109.903 008(3) | 0.124 70(61) |
| 111Cd | 110.904 184(3) | 0.127 95(12) |
| 112Cd | 111.902 764(2) | 0.241 09(7) |
| 113Cd | 112.904 408(2) | 0.122 27(7) |
| 114Cd | 113.903 365(2) | 0.287 54(81) |
| 116Cd | 115.904 763(1) | 0.075 12(54) |
By 1961, the chemical measurements ofAr(Cd), seemingly consistent with each other, had averaged to 112.40 with little spread,whereas the mass-spectrometric measurements yielded 112.41 to 112.43 with the recommended atomic weightAr(Cd) = 112.41(1).
In 1985, the Commission re-examined the available mass-spectrometric data and recommended a value ofAr(Cd) = 112.411(8), which was revised in 2013 to 112.414(4).
The "g" annotation arises from the presence of naturally occurring Cd fission products found infossil reactors at Gabon, south-west Africa.113Cd is β–, but its half-life is so long (1016 a) that it does not affectAr(Cd) measurablyeven over geologic time periods. It decays into the minor isotope of In, but abnormal occurrences ofthat element with anomalousAr(In) from the decay of113Cd have not been reported.
© IUPAC 2003
CIAAW
Cadmium
Ar(Cd) = 112.414(4) since 2013
The name derives from Greekkadmeia for "calamine" (zinc carbonate), with which it was found as animpurity in nature. It may have been found in furnace flue dust in Thebes, a city in the Boeottia regionof central Greece. The mythological king of Phoenicia, Cadmus, founded Thebes and would be a sourcefor the name of the ore. The element was discovered and first isolated by German physician FriedrichStromeyer in 1817.
Isotopic reference materials of cadmium.
