Chemistry 0.0 / 5 ? ChemistryKey Definitions of Whole courseASOCR Created by: livvibusbyCreated on: 09-09-15 17:58 Ions A positively or negatively charged atom or (covalently bonded) group of atoms (a molecular ion) 1 of 8 Isotopes Atoms of the same element with different numbers of neutrons 2 of 8 Atomic Number Number of protons in the nucleus of the atom 3 of 8 Mass (nucleon) Number The number of particles (protons and neutrons) in the nucleus. 4 of 8 Relative Isotopic Mass The mass of an atom of an isotope compared with 1/12 of the mass of carbon-12 5 of 8 Relative Atomic Mass (Ar) he weighted mean mass if an atom of an element compared with 1/12 of the mass of an atom of carbon-12 6 of 8 Relative Molecular Mass (Mr) The weighted mean mass of a molecule compared with 1/12 of the mass of an atom on carbon-12 7 of 8 Relative Formula Mass The weighted mean mass of a formula unit compared to 1/12 of an atom of carbon-12 8 of 8
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