Relative Mass 0.0 / 5 ChemistryAtomic StructureA2/A-levelAQA Created by: iloverevision:)Created on: 21-05-19 14:53 Relative Atomic Mass average mass of an atom of an element on a scale where an atom of carbon-12 is exactly 12 Ar of each element is shown in periodic table 1 of 5 Relative Isotopic Mass mas of an atom of an isotope of an element on a scale where an atom of carbon-12 is exactly 12 2 of 5 Calculating Relative Atomic Mass relative isotopic mass - usually whole number relative atomic mass - average so not whole number given percentage multiply % by isotopic mass & divide by the total % 3 of 5 Relative Molecular Mass average mass of a molecule on a scale where an atom of carbon-12 is exactly 12 to find Mr, just add up relative atomic mass values of all the atoms in the molecule 4 of 5 Relative Formula Mass average mass of a formula unit on a scale where an atom of carbon-12 is exactly 12 used for compounds that are ionic or giant covalent to find relative formula mass, just add up relative atomic masses of all ions in formula unit 5 of 5

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