Chemistry Definitions 0.0 / 5 ? ChemistryAllASOCR Created by: XxxEllaxxXCreated on: 11-03-16 18:34 Isotope Atoms of same element with different number of neutrons 1 of 7 Atomic (proton) number Number of protons in the nucleus of an atom 2 of 7 Mass (nucleon) number Number of particles (proton + neutron) in the nucleus 3 of 7 Ion Positively or negatively charge atom or (covalently bonded) group of atoms (a molecular ion) 4 of 7 Relative Isotopic mass Mass of an atom of an isotope compared with 1/12 of the mass of an atom of carbon-12 5 of 7 Relative Atomic Mass (Ar) Weight mean mass of an atom of an element compared with 1/12 of the mass of an atom of carbon-12 6 of 7 Relative Molecular Mass (Mr) Weight mean mass of a molecule compared with 1/12 of the mass of an atom of carbon-12 7 of 7
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