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14-11-2020
Chemistry

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How is atomic mass calculated for elements on the periodic table.

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quasarJose quasarJose

14-11-2020

Explanation:

The atomic mass of elements on the periodic table are derived from the proportion of the geonormal abundance of the different isotopes of an element.

Using a mass spectrometer, the proportion/percentage/fraction by which each of the isotopes of an element occurs in nature is determined.
This proportion is the geonormal abundance.
From this the atomic mass of the element can be derived.
Simply multiply the mass by the abundance and sum the values for the same isotopes together.

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