Substantial deviations in atomic weight of the element from that given in the Table can occur. Modified isotopic compositions may be found in commercially available material because it has been subject to an undisclosed or inadvertant isotopic fractionation.Value being given the tabulated value should be applicable to any normal material. Range in isotopic composition of normal terrestrial material prevents a more precise.The difference between the atomic weight of the element in such specimens and that given in the Table may exceed the stated uncertainty.
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