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Isotopes
Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.
Relative abundance
Relative abundance refers to the percentage of a specific isotope of an element present in a naturally occurring sample.
Relative atomic mass
The relative atomic mass of an element is a weighted average of the masses of its isotopes, based on their natural abundances, compared to 1/12th the mass of a carbon-12 atom. Since it is a ratio, $A_r$ has no units.