Answer :
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.