Key term for AQA GCSE Chemistry, used in Atomic Model and Isotopes.
The average mass of an atom of an element compared to 1/12th the mass of an atom of carbon-12, taking into account the natural abundance of each isotope.
Relative atomic mass ($A_r$) appears in AQA GCSE Chemistry revision content for Atomic structure and the periodic table, especially Atomic Model and Isotopes and Relative Atomic Mass.
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