Relative Isotope Mass - is the mass of an atom of an isotope compared with one-twelfth of the mass of an atom of carbon-12, Relative Atomic Mass Ar - is the weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of carbon-12, Relative Molecular Mass Mr - is the weighted mean mass of a molecule compared with one-twelfth of the mass of an atom of carbon-12, Relative Formula Mass - is the weighted mean mass of a formula unit compared with one-twelfth of the mass of an atom of carbon-12,

Match-Up Relative mass definitions

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