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How are the relative abundance of each hydrogen isotope affects hydrogen's average atomic number?
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How does the relative abundance of each hydrogen isotope affects hydrogen average atomic mass?
The atomic masses shown on the Periodic Table and listed in chemistry textbooks are "weighted" averages of all the naturally occurring isotopes for the particular element in question. The higher the abundance of a particular isotope, the more that isotope contributes to the overall weighted average - that is, to the Atomic Mass on the Periodic Table. Since hydrogen's atomic mass is 1.00 794 atomic mass units, it is clear that the Hydrogen-1 isotope is the most abundant of the three naturally occurring isotopes of hydrogen: protium, deuterium, and tritium. Protium makes up far more than 99% of any naturally occurring sample of hydrogen with deuterium (1 proton and 1 neutron) making up almost all of the rest. Tritium (1 proton and 2 neutrons) is typically present only in trace amounts. To determine the average atomic mass, the masses of the individual isotopes and their relative abundances are measured using a mass spectrometer. Then the fractional abundance is multiplied by the measured isotopic mass for each isotope and the products of these multiplications are then added together to give the recorded atomic mass on the Periodic Table.
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