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Because isotopes of hydrogen are unevenly distributed in nature, "the standard atomic weight that used to be in the table wasn't actually the atomic weight of any occurrence of hydrogen," says Michael Wieser, an associate professor at the University of Calgary and secretary of the commission.
In a previous paper [1], the bipolar model of oscillations in a chain system was applied to the standard atomic weights of the chemical elements.
While the variation in isotopic abundances is incredibly useful, it made a mess of the official table of standard atomic weights.

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