What are the units for isotopic abundance?
These are reported as percentages..........
Some few nuclides occur as a single isotope, i.e. they are 100% abundant. Examples include
The vast majority of nuclides, especially the transition metals, occur as a mixture of isotopes, where the atomic mass quoted on the Periodic Table, is the weighted average of the individual isotopes.
Isotopes differ with respect to the number of which fundamental atomic particle?