Atoms, Ions and Isotopes 0.0 / 5 ? ChemistryAtoms, ions and compoundsA2/A-levelOCR Created by: charleyCreated on: 30-08-18 13:15 Isotope Atoms of the same element with different numbers of neutrons and different masses 1 of 6 Relative atomic mass The weighted mean mass of an atom of an element compared with one twelfth of the mass of an atom of carbon-12 2 of 6 Relative isotopic mass The mass of an atom of an isotope compared with one twelfth of the mass of an atom of carbon-12 3 of 6 Relative formula mass The weighted mean mass of the formula unit of a compound compared with one twelfth of the mass of an atom of carbon-12 4 of 6 Relative molecular mass The weighted mean mass of a molecule of a compound compared with one twelfth of the mass of an atom of carbon-12 5 of 6 Relative atomic mass equation The sum of abundances multiplied by the masses divided by 100 6 of 6
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